Everything I have read says if your setup properly for CO2 on your kegerator you should be fine with with the beer gas, stout faucet and using the nitro regulator. The faucet adds the resistance needed to hold back the increased serving pressure of the beer gas. I would carbonate per directions if you have it and play with the serving pressure till you get it dialed in. Let us know how it goes. This is in my future as well.
Cort