Create a free scripts and styles template within a plugin

It seems a little odd to only offer the admin bar for a page, but the easiest solution I can think of would be to use conditional functions to deregister scripts/styles and create custom template files for this specific page.
Unfortunately, you’ll have to figure out all the styles/scripts that are loaded

add_action('init', 'remove_all_the_things');

function remove_all_the_things() {

  if (is_page(123)) {
    wp_dequeue_style('main');
    wp_dequeue_script('jquery');
    // etc
    // remove other actions/filters as well
  }
}

and you can create a custom header/footer with

header-empty.php & footer-empty.php

calling get_header('empty'); & get_footer('empty'); in your page template

Reference:

https://codex.wordpress.org/Function_Reference/is_page
https://codex.wordpress.org/Function_Reference/wp_dequeue_script
https://codex.wordpress.org/Function_Reference/wp_dequeue_style
https://codex.wordpress.org/Function_Reference/get_header
https://codex.wordpress.org/Function_Reference/get_footer

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