I did basically that the other night. I have a small sifter i made with window screen and some plywood. I sifted them out and left the strainer with them in it in the tub, and let them crawl out. Most crawled out, and the ones that didnt, I dumped the sifter and MOST of the live ones stuck to it, and the dead ones fell out, then I turned it upside down and knocked the live ones into the tub. Then I took the ones that fell out, put them back in the sifter and gave them a couple mins to get a good grip, and repeated the process untill all the live ones but a few were in the tray again, then hand picked out the last couple live ones. It was much quicker to do than to type out honestly. That method leaves the skins with the dead ones.
Tomorrow I'm going to put some screen around a piece of eggcrate (the white light diffuser not egg flats) and make a tray to pour them out of the sifter on, so they can crawl straight off and not have to go up the sides. I think that will be much more effective.