Here are my unofficial thoughts on this. I believe this would work. I've done some work with arranger keyboards, and With a GR30, and I own a VG-8. The one problem I can foresee is if you were to solo on your guitar. As soon as you stopped chording and went into solo, the arranger would mess itself up badly. It would probably treat each note of your solo as a chord, thus changing chords for every single note you play. Also, if you do some runs while you play rhythm, it might follow each note and adjust accordingly, almost tracking too closely if you get my meaning.

Sound like an interesting proposition. I've never done it, but I can see where it could work after considerable study and understanding how all this works. It would be excellent if you could go to some nice music store and try it out. It could maybe be done, though I would highly speculate you'd have to change your style of guitar some to accomidate all those other machines.