Here's the low down on what I know on the details on fitting the CBR RR six-spoke wheels on a 919. . .
I don't know if the bearings would swap out between the f3 and RC51. I was focused on fitting the CBR RR wheels on my 919, I was willing to forego the whole USD fork idea. But it did cross my mind. . .fitting the six-spoke wheel to the 954 fork I had bought. I added the $$$ in my head and I quickly lost the drive to mount the forks. Mounting would only lead to more mods I envisioned. . .599 headlight, etc. etc. etc.
I used a CBR900RR rear wheel, not an f3 rear wheel. I didn't go as far cross-referencing the rear wheels of the 900RR and the f3. They do look similar. The cush drive of the 919 is a direct match to the 900RR which led me to obtaining the RR rear wheel ($85 shipped, Ebay!!). ALL 919 collars, axle, and rotor will bolt right up to the 900RR rear wheel. . .it's a direct swap. It was too simple. . .so simple that I wanted a little challenge of using the RR's smaller/racy rear rotor. That required the use of the 900RR's caliper mount ($12 shipped, Ebay). Even that was a minor fabrication. EZ.
The front was a little more of a challenge. I was shooting in the dark. I first purchased a 900RR because it uses 296mm rotors (which is the same diameter as the 919), but I didn't research deep enough to find that it was a 16 inch wheel. It also would've required machining collars to fit the wheel on the 919s forks. I was looking for an all bolt on solution using all Honda parts. For those reasons the 900RR wheel was resold. ---Further research found the CBR600f3, which is a six-spoke wheel was a better fit . . . an almost a perfect fit. Things to note are: f2 wheels are six-spoke as well, but have fixed rotors not floating rotors; early f3 296mm rotors have 10 buttons and later f3's had 8 buttons (for cost cutting reasons). The more buttons the rotor has, the better heat disappation. The last model years of the f3 had 310mm rotors on 3-spoke wheels. ---With that knowledge, I bought a complete early f3 wheel (mounted with a fairly new Metzler, which I'll resell) with 10 button rotors, and with axle/collars ($110, Ebay). Though 919's and f3's are very similar, the f3's forks are set a few milimeters narrower. By mixing and matching 919 and f3 collars (see photo) all fit PERFECTLY!! The calipers had to be shimmed 1.5mm inward. Done.
954 brakes/master cylinder are upgrades and are not necessary for the conversion. CBR900RR clutch perch does not have the mirror mount for a clean look when using bar end mirrors.
Looking directly at the photo (right side of axle is on left) in order of sequence:
1) Mounting bolt
2) Right side 919 collar
3) Left side 919 collar
4) F3 collar, left or right will work
5) 919 axle
6) Above are shims (ss washers)
Everything works perfectly.