Yamaha knows about the FZ07/MT07 roadrace conversion kits. (I know a couple people with those; they work well!)
The power output is the potential hiccup. Dunno if you've noticed, but quite a few manufacturers have been applying the same engine in what looks like widely differing bikes lately. There's more to that than just saving money on tooling ... they're also piggybacking the emissions compliance across the whole line. All the bikes that use that engine with the same emission control equipment and are close in GVWR (not really relevant for bikes) are "the same" for purposes of OEM emissions certification. Means the engine in this R7 is practically guaranteed to be EXACTLY the same as the engine in the MT07 and the Tenere 700 ... and it hasn't got the jam of the RS660.
Or maaaaaybe they figure out a way to boost the power output some while maintaining emissions compliance, and apply that across the rest of the lineup that uses that engine ...