The cyl walls on the 954 are already really thin, i'd be careful with boring it out.
A 1000rr isnt a bolt-in motor, but you could make mounts, or even easier, sell your 954 and buy a 1000rr
A 1000rr isnt a bolt-in motor, but you could make mounts, or even easier, sell your 954 and buy a 1000rr