STN11000, which is a enhanced version of ELM327 can work fine with k-line @ 10400 bps.
But I get, you probably are using VAG or multi ecu scan, which emulate the protocol direclty on the ftdi chip. Probably a bluetooth bridge wont work, because the bt module wont interpret ftdi specific commands..
OBD-Link does not work with multiecu scan, eg.
You may use a "usb wireless extender".
When I service my car, my scanners are also PC based (I've a Launch bluetooth adapter, as well), the best thing to me is to put the laptop in a tool cart instead of using over the lap, inside the car...