JakeSteph you can write alternate slug drivers. Unfortunately there is currently no official documentation page on this feature but you can take a look at the inline documentation for the ModelUrl extender https://github.com/flarum/framework/blob/1.x/framework/core/src/Extend/ModelUrl.php
Adding a slash / inside of the slug might be a bit tricky though, because to the Flarum router this might appear like a different route entirely, you so might also need to alter the route definition on the forum frontend in PHP and javascript. The REST API routes probably wouldn't require any change because slugs are never used as part of the URL, only as a parameter or query string.
