My dad plays an ovation 12-string. I'm sure he's not going to want to switch to a different guitar. Will Roland's GK2 pickups work on a 12-string? I have a Roland Ready Strat that i use with a VG-8, so I'm very familiar with that. But, Roland doesn't make any sort of GR unit that has styles in it? Dad would never ever have any use for lead voices, because he cannot solo.

So he would need 3 pieces of kit. First, we'd need to see if one of these Roland GK pickups will work on a 12-string. Then, we have to convert that GK signal into midi, and from that device into an arranger module.
There is no way to get around the Roland GK system and get a direct midi connection from his guitar to an arranger module?