Really, how many mechanics still work on air cooled volkswagens?
There are mechanics everywhere who will work on an air-cooled VW. Probably everywhere in the world that they have cars, more or less. However, shops are another story. You don't need a shop to work on an air-cooled VW. You do, however, have to get connected with whoever actually works on them. Mostly you will want to start at the crustiest auto parts store you can find; in my town that's a Napa, they finally closed the ancient Auto Value — first it became a Napa, then it merged with the Napa and brought their bitchin' parts bins with them with the really old keys, studs, worm screws etc.
So yeah, you're going to have a hard time finding a shop that will work on your VW. Hell, some euro shops don't want to dick with the old Mercedes diesels any more because the guys who knew how to work on them have retired, and they have none of the specialized tools. There are not so many of them, but they are mandatory.
The story is pretty much the same for those cheap Chinese scooters and ATVs. You can't take them to the dealer, since there is no dealer. But anywhere those things are prevalent, there's a bunch of guys who know all about them. They are almost without exception clones of something Japanese, and parts are readily available if you know what to buy. You find someone who knows what they're doing through the local Motorcycle and ATV shop, but probably not at it. They won't want to mess with your POS, in all likelihood, but they'll know who will.