I would love that too, fight through randomly generated dungeons. Although I suspect that it would be best for a new version of the map.

if you wanna do this, just download this https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3048046612
this mod will automatically spawn either combine, hostile rebels or zombies and you can summon the using this command: raids_start_X_assault (number of max enemies on start of assault) and replace X with either combine rebel or zombie. you can also use raids_start_X_assault_no_escalation (number of max enemies) this will disable automatic raid escalation (over time will add more max enemies)
hope this helped!