I don't understand how those setups can produce a good pour, and finding a place to fill or swap CO2 tanks is pretty easy in most places.
Check to see if there is an Airgas branch in your area: https://www.airgas.com/
Airgas is in my area but the local homebrewers advise it is very expensive compared to other local options. That doesn't mean I won't go the refill route, just an observation. I could certainly try the mini-regulator idea and if it seemed impractical I'd still have a device I can use for portability. (Thanks to Tony's input since I started this post about 45g cartridges not lasting long.)
For the faucet, the proof would be in the pour, methinks. I am weak in science, but if I read the Brewsmith article about balancing lines correctly, the length of the beer line is used to regulate tap pressure, with length of the line increasing friction and therefore modulating the difference between the beer coming out of the keg and the beer coming out of the tap.
My guess is that the practice of using the length of beer line to manage tap pressure is an outcome of using hose in the first place as a way to deliver the beer, not vice versa. I'm willing to believe devices other than hoses could regulate tap pressure.