Lagering using a Corney keg

I am curious to find out if you can lager in a corney keg without an air lock?  I have corney's with PRV's but not a lid for fermenting.  I would think I could do my normal primary and secondary and then move to a corney keg to lager in the fridge.  I would presume I would have to purge the O2 and put some CO2 in the keg when I lager.

I would like to make a Killian's clone again but need to lager it for 3 weeks and can't use my kegerator like I did with the first batch.  I am hoping to avoid using a glass carboy and chilling with ice and rags. 

Any help would be appreciated.

I would think I could do my normal primary and secondary and then move to a corney keg to lager in the fridge.

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Short answer: Yes.

Long answer: I make lager in the winter when I have a place in the basement where I can ferment and secondary them somewhere between forty and fifty degrees.  Each then goes into a corny keg that's placed into a chest freezer that's plugged into a Johnson controller set to 32.  After a month or so it's ready to tap and enjoy.  Tap it too early and it will have a "green" tang that will remind you of the worry you may experience when you taste the final gravity reading and wonder what you did wrong.  I assume you taste everything along the way.  I do.  Anyway. Try it.