Disclaimer: I've only used this tap once and don't keep kegs on tap regularly (I don't have dedicated fridge space nor room for a dedicated keezer where I am now).
This worked great for me - just dialed the pressure down to like 2 psi (for a 3 gallon keg). The important thing to remember is that you are not trying to reach a state of equilibrium (i.e., balanced system) - this is only a temporary solution. As others have mentioned with reduced pressure in the headspace of the keg, you'll have CO2 coming out of solution (increasing the pressure). Also, if the keg is warming, you'll have CO2 coming out of solution (increasing the pressure). However, these are easy to compensate for.... keep the keg cold (ice, keg glove, just wrap it in a blanket, etc...) and every once in a while pull the pressure relief valve on the keg. It worked perfectly fine for me for 3-4 hours. There was only one compliant about the start of one pour being "a bit foamy and fast" (the keg didn't have a pour for a while and I had neglected to tell my company to bleed the pressure before pouring).