If all you're doing is charging kegs for dispensing I think you'd be find. There's enough pressure in the head space to dispense so you're not dependent on rate of gas flow - at least for a couple of pours.
That said, I did opt for the 5mm ID EVABarrier for my gas systems, but that was because I had stemmed regulators and it was a bit easier to get the wider ID lines over the barbs. I think my longest run is 12 feet from reg to manifold then another 4 feet for the drops. No issues, but obviously that's half the run you're looking at.
Perhaps our resident gas physics wizard
@doug293cz will check in with his opinion
Cheers!