I don't think you need to do anything special to use a Corny keg as a primary fermenter. At most, you just need to fabricate a "blowoff tube," which you could do by simply connecting some beverage line to a black "Beverage" ball lock quick disconnect, and leave the other end of the tube open. Drape it into a bucket of StarSan and you're good to go. I'd probably remove the dip tube though, to make cleanup easier, unless you were planning on using it to push the beer out into another vessel later on in the process, but you'd probably want to use a shortened dip tube for that.
It's easier if you do this with a gray gas disconnect.
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