Hope you are doing well there in China. I don't know if this will help but I read a review of a company called something like Borneo Bike Adventures in a UK bike magazine last year. From memory, they rent Aprilia Pegasos but I think it might just be for accompanied tours. Worth a google maybe?
Glad to hear you are doing well and it's an interesting post on ADV - seems like Jialing really know about customer service and the sidecars look pretty funky! I can't imagine that happening in the west unless you had purchased an NR750 or such exotica.
Yep, the link takes you to the outfit, and indeed the article in Bike magazine - looks great but reading the article and the customer testimonials, I think we still have it pretty good up here in GT land