First, Vario makes a footrest "system" that allows 360 degree adjustment and the drop can be controlled with 23mm, 30mm or 50mm adapters.
Second, The first aftermarket seat I bought for my SMR was a Corbin. It wasn't much more comfortable than the stock seat. And, while it was 1/2" or so lower, it was also wider and there was absolutely no difference in reach. I'm 5'5" and have a 29" inseam.
Third: I lowered my 950 Adventure 2" front and back and the only handling problem I saw was dragging the foot pegs. If anything, it handled better and the suspension had the same travel as my SMR. Which by the way, has the same suspension as the SM. The only KTM Supermoto with shorter legs is the SMT.
I spoke to half a dozen suspension shops and they all said that if both ends were lowered at the same time there would be no loss in handling other than that the bike would turn a little quicker. I only had the Adv up to 105 and it was rock solid.
"For those who fight for it life has a flavor the protected never know."
USMC 65-68 RVN 66-67