not sure if this is any help, but there are a few labs mentioned in this old thread:
maybe some are still around that you can use ...
maybe you should become good friends with one of the mom and pop stores you mention
feed them film and money and they will become your friend too.
if you don't want to do that, shoot e6 and process your own chromes in a unicolor or jobo drum.
you don't need an enlarger or darkroom equipment to speak of, just the drum and a roller,
and you can sell it before you leave china.
and black/white well, that is as easy as just buying some cheap instant coffee and fixer.
go to dpug.com and learn how cheap, easy and good using a scanner is and how
a hybrid workflow might be the way to go, it certainly is for 90% of the color labs out there ...