Y'all don't see much of me over here but I did keep SW
for a few years. :P
You can use a Rubbermaid tub to keep your rock "alive" while you're working on the tank. Drain water out of your tank to the tub, move your rock over, and add your powerheads for circulation.
I've always been told to start over with new bags of sand when swapping tanks (I'd consider this a tank swap, basically). I'm not sure if that's the best way to go about it, but it is what I have done in the past.
I do not envy you this task... good luck with everything.