Of course, go for it, the throttle works both ways! I went straight from an RG125 with one years riding experience in total to a GSXR1100, at the time the most powerful bike there was, and I'm still here

On the other hand, I wouldn't particularly trust the K1200R if it has servo brakes. A guy I know had one and they failed entirely with no warning, he just about managed to miss a bus ran and rand off the road luckily into an estate where he managed to come to a stop without hitting anything. Half an hour before he'd been hitting 140 on a racetrack. Put me right off powered brakes after hearing that.