Function to allow single post template based on custom taxonomy?

I think what you’re looking for is the WordPress Template Hierarchy. Basically you can just name the template single-{custom-post-slug}.php and put it in the right directory.

Update

Now that I understand what you’re actually asking: I bet you could hook {$type}_template, which is called by get_query_template(). It’s expecting a path to the template which has been loaded. You can filter based on get_queried_object() so that the correct template is used in the correct place. It’s probably gonna take a bit of tinkering and a lot of print_r()ing on your part, but I think it’s doable.

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