After pondering on such a possibility for quite a while, I decided to bite the bullet and finally got myself a Roland GR-20 guitar synth!
http://www.roland.com/products/en/GR-20/index.html
I uploaded a song on my Myspace profile, named "Rules of Contact", which has exactly zero keyboard stuff (at last!). Tell me how you like it (or not!).
More info on the exciting GR-20 to follow.ude: