I'm keen on knowing why Mr Tuner does not recommend them... the are a tried and tested product.
When I mean a whole heap of other things, you'll need a new rail - the bolts don't 100% line up, the FPR location isn't ideal, and the overall fitment of the rail doesn't quite work. Been there done that, we were going to re-use the 650cc SARDs from my NEO in the RB2630 build we did, ended up ditching that idea after finding out the amount of work necessary. Ended up swapping the 650cc injectors for a set of SARD 800cc RB26 injectors that a mate had bought incorrectly.
Up to you though... if you got money to burn, everything is possible.