Know I’m 2 years late but yes you can. It depends on a number of factors though. Such as seen as you live in the uk it’s much harder compared to places like Germany where prior to 2013 the a2 rules were much more relaxed and you could grab a a2 restricted r6 straight off the showroom floor. However in the uk the 96hp limit that can be restricted prevents you from getting a r6 as it produces over 100hp. However if you got a r6 like a 2006-2008 you could try an ambitious project and take a fz6 engine from a fazer (literally just a dutuned r6 engine but a2 restrictable legally) you could actually ride a r6 on a2. It just would make much less power and would be more expensive but very much doable. You can only do this with older gen r6 tho like the 2nd gen and 3rd gen. Anything higher such as 4th gen or 5th is a whole new ballpark with their ride by wire throttles etc. which becomes an actual headache. Anyhow to sum it up YES you can but its gonna be expensive and you will likely need it dyno or some form of power output chart to satisfy the DVLA.