Icy,
I would find another tuner.
On my buddies dyno we have tuned my own 124, 131, and a 120r with a PowerVision so saying it won't tune yours effectively is wrong. I think you are getting miss information or information that supports the only way someone can do a tune because there is no brake. Because there is no brake on the dyno is the reason he is pointing you to the PC5, because he can use it somewhat by doing roll-ons (Sweeps) throughout the range one after another to try and capture data in the cells as he revs yours out. The PC or PV would really need a brake to do it efficiently albeit a carb'd bike.
The PowerVision allows you to tune and leverage the manifold pressure system by delphi vs. PC5 which is alpha-n running on top of the manifold pressure that is built into your bikes fueling system.
I would call Dynojet and ask them if they felt the PV couldn't tune your bike.

You can also ask them who in your area is tuning with WinPV and the new features they just released to the tuners.