I have a combined USB/ParPort-to-Bluetooth adapter. It works perfectly -- well, with my Sony Ericsson P910i and my Fujitsu Winblows tablet at least. Never tried it with Linux, and as long as the 770 doesn't have LPD and/or CUPS, there really is no point in trying it on that platform.

As to the Nokia 9500 printing, that's a Symbian Series 80 device, a very nice O/S indeed, but as far away from Linux as one can possibly get.