I'm all for the suspension upgrade. That, in itself, will give you a better ride. And, if your looking for a plush ride, definitely, change the OEM seat! Many good seats on the market, will make your ride more plush. The Traxxion system will also improve the handling in the corners, if your into that riding style.
Please pardon my ignorance but couldn't you just swap a triple tree from valk? I don't even pretend to know the answer but I've always thought that the F6B and the Valkerie were the same bike with differing amounts of plastic and electronics added to B. If this is not the case please educate me so I don't go around sounding like a dumbass. Lol.