Got 2 in my RLA fridge too.
Testing out my new setup a few years back:
Still using the same connector to purge and degas.
This was when we didn't have access to the connectors with a pressure release so we were all coming up with ways of doing it. My solution was to remove the 1 way valves from the gas in and beer out. I then fitted the 1 way valve from the gas in to the beer out and added the ball valves. I then connected the gas line to the beer out so I can insert gas through the spear and degas from the 'gas in' side without the risk of spraying beer everywhere. The 1 way valve I put on the beer out is to stop any beer coming back through if there is no gas pressure. Ball valves are cheap enough on ebay and this works like a charm!
Of course, if you didn't want to purge the keg you can just use the coupler, below, (not connected to gas) to put on the keg to just degas it.
And if you want to ruff it, just lay the empty keg on its side and connect an unmodified coupler which will degas it with minimal risk of a beer shower.
