What would you consider stripped down, and what would you consider still 5e? Are you talking Nimble 1e or 2e?
Does Shadowdark count, for example? What about something like 5 Torches Deep or one of the other OSR-5e's?
I was also thinking about shadowdark. It has some changes (mostly spellcasting) but to big degrees its just 5e stripped down (with more focus on dungeon crawling).
Thank you OP, I have been contemplating opening a thread like this myself.
Specifically I am looking for something inbetween Shadowdark and 5e. Something like 5e without subclasses.