Templating advice sub posts of a CTP

For an easy solution, you could just create page templates and set their Template Post Type to match your custom post type. WordPress has supported custom page templates for other post types than page too since version 4.7.

You can read more about it from the Theme handbook // Creating page templates for specific post types

This way you could use the native template selector that you can already see on a page’s edit screen on the Page Attributes metabox.

Would this be a viable solution for you?

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