I have R1 yokes that were to go onto box eye 600. Never did it in the end up but i accumulated most of what i required
Top and bottom yokes
New front wheel and spindle arrangment
Mudguard
Stem, although this will need to be checked against the fazer headstock, it may be possible to have the fazer stem pressed into the R6 yo0kes (this was my plan). If that is to be the case, spacers will be needed for the yoke eye size difference where applicable
The major issue comes from the fazer speedo sensor. There is no slot to fit in other model's wheels so likely you would need to lose it. In doing so though, you murder the midrange of the bike as it is connected to the TPS. I think there is a way of doing it successfully but its way above my pay grade