If you've already got the hex-pickup on your guitar for the GR-33, why not add a VG-8EX or VG-88 for guitar sounds? They're incredible units; my VG-88 is the best guitar processor I've ever owned or used.

And before anyone starts posting rubbish about it;

1) It's not a synth
2) There's no triggering, so there's no triggering delay
3) It does pickup modelling, guitar body modelling and amp modelling
4) It does pitch shifting and harmonisation independently on each string without any delays
5) It has a very good FX section too...

Or a GT-6?