Ibanez has a
custom shop in LA but they only do work for endorsed artists.
My 7's are very different from the UV's. The necks are rounder and shaped a bit more to my hand, the body is contoured at the slope to my body (just thinner than usual), smaller frets, different pups, etc. But, the UV is a great 7 string. Can't go wrong with it other than the typical "Signature Series" assumptions.
The JP model is very nice as well. I haven't played them much, but the one I did play felt great. And other brands.. hmmm.. I think Schecter is the only other brand still making a 7. Try them all out and decide what's best for you.
Dave