The easiest way by far would be as you suggested to use a page coupled with comments. Restyle it so that it looks more like a guestbook.
I’m sure there are plugins out there that do this but I don’t see the point as you’ll need to restyle them anyway and it just slows down your site.
Related Posts:
- Allow member to have access to custom post type only. Permission to only edit their own posts
- With Rest V2 (WP4.7) how does one restrict certain RESTFUL verbs?
- How to assign specific users the capability to edit specific pages / posts / custom post types
- REST API: How can I restrict a custom post type to only be accessible by authenticated users?
- Show custom post type endpoint in REST API just if user has capability
- Add comments meta fields to comments metabox on post edit screen
- Remove Custom Post Type menu for non-administrator users.
- How to automatically apply a password to all posts within a custom post type
- create a back-end wordpress content submission using custom post type
- changing default comment form arguments [duplicate]
- Allow Users Access to Custom Post Type Only
- Making a Custom Post type only visible to non-users via a specific link
- Custom post type capabilities require “create_posts” to access the edit posts list page
- Limit users by custom taxonomy and user roles
- How to add extra input fields to CPT’s comment form?
- How to restrict CPT post’s fronted view only for specific user roles?
- Create custom post with custom user rules
- comment_form() not showing on custom post type
- What functions does WordPress use for filtering / sanitizing comments?
- Make (custom) post type accessible only by custom query
- Building Forums with Custom Post Types
- Comment form on custom page template
- How to handle this specific case of custom post type?
- duplicate comment section functionality and call it something else for custom post types
- Restrict category access to specific users/groups. Author always has access
- Send email messages after comment was submitted
- Accessing a protected property of a post
- Post/Custom Post Type URL Access
- Remove plugin settings from post creation page for a user role
- How do you make a custom post type invisible for subscribers
- How to create new permission for custom post types for doing specific tasks
- How can I remove “Add new” button on custom post type
- Comments not enabled for custom post types
- Allowing logged in users to create custom posts
- strange conditional tag behaviour [duplicate]
- Error 403 when posting comments to a custom post type from a different page
- How do test if a post is a custom post type?
- Where to put my code: plugin or functions.php?
- What does this PHP function code mean? [closed]
- Remove slug from custom post type post URLs
- How to disable the single view for a custom post type?
- Custom post types, taxonomies, and permalinks
- Query all posts where a meta key does not exist
- How to create a permalink structure with custom taxonomies and custom post types like base-name/parent-tax/child-tax/custom-post-type-name
- How to get all taxonomies of a post type?
- How to sort the admin area of a WordPress custom post type by a custom field
- How to create a custom search for custom post type?
- Deregister custom post types
- Can I assign a template to a custom post type?
- Permalinks: custom post type -> custom taxonomy -> post
- Should I use custom post types or a custom database tables for plugin development?
- Enable revisions for custom post type
- Extending the search context in the admin list post screen
- How do I query a custom post type with a custom taxonomy?
- Adding a Custom Post Type into the menu screen
- Pagination not working with custom loop
- How to Add Tags to Custom Post Type?
- How come Featured Image isn’t showing up in my Custom Post Type?
- Custom Post Type URL Rewriting?
- Add category base to url in custom post type/taxonomy
- Include custom taxonomy term in search
- Is It Possible To Add Custom Post Type Menu As Another Custom Post Type Sub Menu
- Adding ‘menu order’ column to custom post type admin screen
- Capabilities and Custom Post Types
- Can the Next/Prev Post links be ordered by menu order or by a meta key?
- what is the correct way to compare dates in a WP query_posts meta_query
- Use register_post_type() to modify an existing post type
- Custom Taxonomy specific to a Custom Post type
- Renaming Custom Post Types and Taxonomies
- List all posts in custom post type by taxonomy
- Redeclare/Change Slug of a Plugin’s Custom Post Type
- Mixing custom post type and taxonomy rewrite structures?
- Advanced search form with filters for custom taxonomies and custom fields
- Highlighting wp_nav_menu() Ancestor Class w/o Children in Nav Structure?
- Resolve a custom post type name vs. page permalink conflict (same slug)
- Get custom post_type’s archive URL
- Enable Gutenberg on custom post type
- Is there a way to get N number of WYSIWYG editors in a custom post type?
- Can multiple custom post types share a custom taxonomy?
- How to Add Custom Fields to a Custom Post Type?
- Hook for post and page load
- How to enqueue scripts on custom post add/edit pages?
- How to display value of custom fields in page
- Where are wordpress custom types stored?
- Using save_post to replace the post’s title
- Custom Post Type pages are “not found”
- Possible to hide Custom Post Type UI/Menu from specific User Roles?
- How do I safely change the name of a custom post type?
- Custom post type single page returns 404 error
- Change “Enter Title Here” help text on a custom post type
- Hide content box with Custom Post Type?
- Change the text on the Publish button
- WP REST API fetch posts from post type
- Remove taxonomy slug from a custom hierarchical taxonomy permalink
- Adding categories to custom post type in permalink
- Load a script just to custom post type in admin
- Display all posts in a custom post type, grouped by a custom taxonomy
- How do you use a CPT as the default home page?
- get_terms by custom post type
- single-{$post_type}-{slug}.php for custom post types