i know this is an old thread, but we just racked some beer last night into a corny to use as a secondary. this is what we did.
and here's a close up. its just a short piece of sanitized tubing. we just took the valve off, pulled the dip tube out and put the peice of tubing on it. it was kinda a pain in the ass to get over the threads, but it works. and as you can see. the keg built alittle pressure.