I worked with a guitarist that had MIDI pick ups set up on his guitar. He said it wasn't perfect but since he wasn't a pianist, it worked much better and faster for him. Just a thought. I also have an guitar with MIDI ports.
I have a You Rock guitar and if I concentrate it's actually pretty good for midi input. It's not fun like playing a regular guitar - really have to concentrate - but it's way better than my keyboarding skills. The people that use the midi guitars like the You Rock or the Yamaha in the demos make them look easier to play than they are imho. It's a different animal to learn to play.
My problem up to now has been a midi software that I can get anything useful done in that doesn't grind me down. I'm a little technologically challenged - alot of the tech and software baffles me. I don't understand why some of this stuff is so hard to learn to use / or get to work as it should.