I don't have any experience with SF's switches specifically, but there should be some way to remove it without damaging the saber. Typically, these are screw-in. Feel/look inside the hilt and see fi you can see a hex nut on the back of the switch. That should get you in the right direction.
If there isn't one there, it looks like SF loves to glue their AV switches in. Use a heat gun to melt the glue and try to push it out from inside with a screwdriver or something.
As far as hooking the electronics up, there are a lot of wiring diagrams in other threads.