One thing to keep in mind is these new seats are also wider I believe ? So although you might be an inch or two lower, it will still be harder to put your leg down, unless you are smashing the twins against the tank at every stop then maybe not.
I was also going to suggest lowering links. They shouldn't change much about how the suspension performs other than just the smaller amount of travel. They are also WAY cheaper than a new seat.
My suggestion, go sit on a few different bikes and see what seat height you actually need to feel comfortable. You might find the KLR will never be able to be made to fit you properly. No sense in buying a bike you can't ride safely.