making the permutating biped wouldn't be very hard, but the fp would be. If thats the thing to do, switch arms per weapon with anim. I'd use the rename tool alot for this one, de-'frame'ing the frames to be hidden(fp-wise), to import anims onto the visable pair. Then there's re-skinning the pairs of arms with a common root. You wouldn't want to link both pairs to a new root, because the anims wouldn't import right (iirc).
I think that means new fp weapon anims too. Similar process, only more complicated with the linking
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