Using two permalinks for one post

Using two permalinks for one post

I am developing a wordpress website for a client, the client want to show 2 separate templaes for post details the scenario will be.

user clicks on post and our default single.php will load up, there have a play button when user click on play button then instead of post name in permalink I want to add /play/post-name and need to load second template for that.

searched on internet and found some suggestions like Maintaining two permalink structures and https://wordpress.org/support/topic/multiple-posts-in-1-permalink but these are not working and also these are trying to add at the end of the link but i need it to before post-name

any help will be appreciated.

thanks