I would suggest that you look around for mail order labs, I don't know what the postal service is like in Shanghai, but in London, that's what I do. I've got pro labs I can walk to easy, but I prefer to send off, it's easier than walking down one day and walking back the next, got better things to do...

If film processing collapses in your part of the would, I'd deal with it when it happens. For B&W, processing yourself can be easy, but the enlarging requires a lot more space and kit. I'd reconsider scanning, I know it's taboo to speak of it on this forum, but scanning medium format can give superb results on reasonably inexpensive scanners.

I will say though, that I don't think you can do any better than a GF670. It's just beautiful to behold, and a statement that in this age of plastic computers for cameras, there are companies making medium format folding cameras. It's very portable and easy to use to, amazing camera really.