Just watch for rot and mold, I had that issue. I just cut it away, but I don't think there's enough of a base left for it. I'll try it either way, what's the worst that happens, it dies? It would have died from rot and no roots anyway, lol. It would probably help to dip it in a fungicide first to clear off any microbes that attached to it while it was in that cup. Dunk it in some KLN and either do the bag method or some people have suggested containers with half orchid bark mix and half sphag.
Good luck!