Not all that hard, but it would require a major IC board redesign to handle to different software data input devices. Since the rest of the technoloy in that unit is about 6 years out of date (it was new five years ago right?) I guess the MoCo feels that they should wait until they come out with a completely redesigned unit.
Yes, but SD Card - for GPS as well as cameras, was hardly new then, and that WAS the redesign! A little more thought would have made it so much better..... Even sufficient NVRAM to load the Map data from an entire CD at a time...... After all, it really is a great design, with the modular approach, for Intercom, AM/FM Radio, CD, MP3, GPS, CB, XM (in North America), and Bluetooth (such a shame they discontinued that!), with space reserved (according to the wiring diagram) for future devices, and user upgradable firmware. And it all integrates so beautifully into bike's hand controls....
It's all-in-all a fantastic unit, with very few shortcomings - shame the GPS is one of them, but even so, it's better than no GPS at all.
Jim