Wow. That is a fascinating possibility, for sure. I would like to ask some technical questions about what the hold outs in the engine are, but I don't have a reliable or useful logic and coding background to make any sense of it. But, I'll just say that your idea sounds pretty cool.
Always thought it interesting that Temple Trekking as a whole, didn't really have any kind of scaling difficulty similar to Pest Control's level 40->70->100 difference. When I first ran TT I expected the different chosen companions to be a level difference, not just a difference in amount of mobs spawned. Would your rework take into account a possibility of level variance, or would it operate how TT is now, with it being mainly a difference in amount spawned and/or the ability to escape or not? Almost sounds like you could make it into a mini DM type activity, managing resources and supplies and supporting a team.
Just rambling and throwing out things that come to mind, hearing thoughts ...