To be fair, my fz1 has triple the hp of a klr and can achieve warp ten in a blink of an eye, a 270 rotor would not cut it for safety reasons, same with a two pot caliper. Getting the weight down is very important for lots of reasons and it sounds like you have a handle on that.
Good luck with your recovery and subsequent bike build looking forward to progress as it happens.
We're not out here to rough it. We're here to smooth it. Things are rough enough in town.