Caracter animation

Hello,

I’de like to animate a caracter with the IK.
That’s ok with the bones but i’d like to swap hands, eyes or mouth on some keyframes and I don’t know how to do it easily??

If I use “permute” on the clip, it changes the clip on all time line. If I put differents hands in one single clip, I can’t see what I’m doing directly on the stage…

Any ideas about that?

(sorry for my english)

Thank you!