I use almost the same system, modified from I think? Biermuncher posting years ago in the "we need no stinking beer gun" thread.
I have a straight rigid tube about 3/8", and a 1/2" piece of vinyl that slips over that, and also slips over the end of my Intertap taps. And a stopper on the tube like in other setups. I do it straight of my taps at the bar. No picnic tap, no messing with pressure settings, works great. Beer usually has just enough foam to cap on but not waste much. I did cider for the first time today, and the lack of foam meant just capping on airspace, but it's getting drank tonight and won't matter.
I've also had beer in there for up to three weeks and din't notice anything objectionable. It might have changed in the three weeks between the keg finishing and me drinking it, but I didn't notice it, and if it did it wasn't in a bad way.