Well since we are on the subject and all do you know of any other setup (other than the 636) that will work and has the inverted gold forks ? Yes the 650r suspension in general is basically a mountain bike suspension and quite frankly awefull!! I'm sure the '12 has to be better than the 08' by far!!!
Gold is just a color.....
I'd think you could adapt just about any USD front end to work with your 650R..... don't limit yourself to Kawasaki in that regard.
Depending on the kind of deal you could arrange, it could become more effective to replace everything altogether.... wheel, brakes, calipers, fender, triples, and fork legs. Biggest impediment would be matching the steering neck for bearings, length, etc.
You'd be surprised how good a conventional damper fork can be, with the right valving, springs and setup. Most of the time, once you have it dialed in you don't need to do anything more to it.
My FZ6 had a horrible front end.... had GP suspension rebuild it, new Ohlins springs, and re-valved with fresh oil --- totally different experience. Work on the fork was relatively inexpensive; I think the fork work was less than $400 altogether including all of the labor.