Ash waste nomads in the underhive

Hello fellow citizens of necromunda! I’m starting a family underhive campaign, and my son wants to play ash waste nomads, I’ve got no problem with this, the reasoning he has come up with for why they are there is sound as well! However, before we commit I just want to make sure there aren’t any severe disadvantages to running the nomads in the underhive. I can’t immediately thing of anything, but I’ll handball it you you guys and see if you can think of any reasons that would work against the nomads, and if there is anything I can do as the arbitrator to help mitigate them.