First thing to explore should be shaving the seat. It is considerably less intrusive to the ride quality than lowering, lowering the bike will make it ride like crap - less suspension travel, pegs are closer to the road so more scraping etc.
Lots of people peel their seats, take out an inch or so of foam between the seat back and where the foam comes up against it and then put it back together. This gives considerable more leg reach.
Another option might be shaving some off the foam where you legs go when you stand, that might give you a bit more still.
Never tried messing with an R3T seat though, it may be a bigger pain than I think but switching out the seating or shaving the existing seating should be your first stop, in my humble opinion.