Apex makes adjustable clipons, kinda like the old Satos. They have an eccentric end that changes the downward angle as you rotate them. It takes some fiddling with the angle to make them work, but they can. I liked the less aggressive angles for daily and distance-riding. They worked fine on track too. You can readjust them back down if you want the more aggressive posture. I might have an extra set I've been holding on to if you're interested. Another positive is the bars are relatively cheap and easily replaced.
I found the Corbin seat superior to the Sargent for several reasons. Mostly because my ass is huge and I can move around the Corbin more freely, haha.
Get some tank grip pads too. I like TechSpec better than Stompgrip for daily use, although StompGrips work better on track when wearing leathers. This makes it easier to take some pressure off your back, shoulders and arms by transferring the weight loading to your core and legs.
Finally, if you really want to screw up the intended use of an RC51, get the Buell lowering pegs and grind them to fit. It gives you about another 1" of legroom, which can extend your saddle time.
I had all these mods, along with the ZG touring screen for a trip to Florida and back. Combined with the fact I had to stop every 100 miles for gas and a stretch, it was actually a good ride! It took 11 hours, but I felt I could have kept going if I needed to.
Later on, I swapped rides with a friend with these mods and he said it compared closely to his Futura with a little more forward lean. Way better motor of course!