The super cheap riser cheat is to use a XBS or sportster upper clamp, flipped over as a spacer. Pull back is something you get with bars so... might as well just get taller bars while youre at it. Not sure if the cables fit, but you aren't going far. Is there some slack now? Are they super tight? Got 5 minutes?? Take the throttle housing/sleeve off the bars, put it back together off the bars and and hold it where it's gonna be...
Theres a bunch of used exhaust on e-bay. Pick your poison. Want a new one? Shop those brands. D&D sounds good.
Not sure what you're trying to describe, but a warped rotor is rare and will shudder at any brake pressure. Are the floating rivets filthy, rusty? Has it sat for a decade? Clean it all up. Best if you remove it. What you may be feeling is just brake pad material thats not evenly distributed on the rotor. Clean both sides of the rotor VERY WELL with brakleen and scotchbrite, then bed the pads correctly or even get new ones. EBC HH pads are good on Buells on the street.