As for the Kemper discussion, I tend to agree adding a synth to the Kemper would make the profiler/amp part a bit too complicated for most users. I would rather see a separate unit dedicated to MIDI creation, etc. But I would not turn it down either if the price was right.
Kemper have offered variations on the basic model with the Power Rack/Power Head and more recently the Stage. An intregrated synth could also be an option.
Onother poster made the valid point about the control surface of the Virus keyboard being quite extensive. Guitar synthesists cannot play and operate a whole lot of buttons and controls at the same time. They are really limited to operating things like pedals and the whammy bar and maybe a breath controller. So the editing and patch design stuff is not really needed for performance - it is more properly part of preparation for performance and the Editor and maybe an optional control surface would have to suffice there.