my best advice.... go drinking where the expats take their customers drinking, make friends with them, get an invite to visit their factory. That's probably your best bet to set up a casual visit to a manufacturing facility. Anyone local, working at a factory, won't have the time of day for you unless you're a customer or bringing them business.
I don't know Taipei, but a saturday night in Wan Chai should get the job done... just bring some extra cash to buy the nannies drinks.
i know it sounds like i'm joking, i'm not.