Why does he need a synth for that? sounds just like an electric guitar, which is his main instrument, afterall
I find it hard to imagine Iommi shredding on a keytar, the man is responsible for some of the best guitar riffs mankind has ever heard.
Just because.. He could trick people into thinking it is his "Old Boy" Jaydee Custom SG.. The Prophet 6 might look cool with cross inlays too.. And Dave Smith could offer a special signature edition.. Lots of reasons!
I don't think Tony would mind using it on a track or two. Something different.. Show Patch 666 in a video.. He could do the Tritone on it! The P6 just might conjure something up if it sounds a wicked enough Tritone. You never know..
Oh, and of course, send the output of the P6 through a Laney TI100 Tube Head and Speaker Cabs!
He could be responsible for some of the best synth riffs too!