Why not just get a stopper and an airlock and stick it in the gas side during fermentation? Then you've got a keg that can be used for fermentation and pouring beer. You can probably get an extra dip tube to cut short relatively cheap and just put that into kegs that you are going to ferment in.
Just saved me some $$$$ lol! Glad I posted here yall think more clearly about beer than I ;o)
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Sitting in the Cozumel LCDH ;o)