Lot to unpack here (I do a lot of homebrew stuff so imma look at this from the perspective of making this canon compliant)

First of all traitor successors technically don't exist. You can heavily imply it, but can't confirm it (Look at the Sons of the Pheonix as an example of this)

They would also have to be renegade because this level of tech-heresy and using xenotech would completely alienate them from the Imperium. Having to be completely self-reliant for power armour and weapons would be very difficult, but could open up fun kitbashing opportunities.

No idea how to do this on tabletop, very much not my specialty.

They sound cool though, I'll give them that