I'll think up some justification for them being there, similar to what you suggested probably. They'll be similar to the Polish Winged Hussars IRL with heavy plate, a lance, shield, sword except instead of two normal pistols one repeater pistol.

If that doesn't work, I can say that the Irondrakes are just rich sons of Dwarf Lords and such who's inheritance is going to brothers and such so they decided to band together and reclaim this for themselves; the squad would be called "the disowned" or something.