wait... you want to emulate a bluetooth keyboard on the pandora (which actually has a real keyboard) to use it with your gp2x (which would require a bluetooth dongle to be working on the gp2x). Sorry mate, but that just sounds pretty nutty. Why would you do this?
Why not use the pandoras real keyboard if you want to control the gp2x with it?
Actually, why not get a tiny little usb keyboard for your gp2x?
Why would you want to carry a setup like the proposed one around with ya? Two handhelds, a usb bluetooth dongle, and then you would always need to have both handhelds powered... doesn't make sense to me. Or just get a bluetooth keyboard for that matter. I can see why you would want that for your Neo Frerunner but not for the gp2x... if you are going to emulate stuff that you need a keyboard for and you are going to get a Pandora anyways, why not use the pandora for that stuff?
This makes my head hurt ^^.