Oooh, I like Devout. I had the same feeling about Sworn, honestly.
There's also Devoted, but I think Devout beats that.
Here's another idea - we could make their bonding work with unique squads as well (not like the Ninjas of the Northern Wind couldn't use help) then make them a 2 figure common squad using one of the sculpts and make a later, "elite" version with better stats that's a 3 or 4 figure unique squad using the other sculpt.
Or am I just being devoured by my own madness?