Perhaps something like this Charging Hose Extension could be left permanently installed. I probably wouldn't. I would be worried about leaks at the quick-connect from vibration over the long-term, and if you need to recharge your AC frequently, it has a leak that should be addressed properly.
As far as accessing the port, it's a pain in the ass, but not really "difficult". Jack up, pull the wheel, pull half the fasteners on the forward side of the well liner so you can pry it back/reach behind it. The fasteners are either phillips, small/medium torx, or a mix of the two.