overgeeked
B/X Known World
The young at heart as well. It’s great fun to not be so rigid. You should try it.Kids and young people in my experience have a higher tolerance for mixing things up and having a good time doing it.
The list of difference between the OD&D, Holmes, B/X, BECMI, RC, and AD&D editions of the game are far less than you seem to think. A lot of people mashed them together back-in-the-day.
It would be fairly trivial to play all the TSR editions of D&D at the same time at the same table. Adding in the WotC editions of D&D is where things would get complicated because there are more differences.