In my last post I wasn’t trying to disuade you from using a brake, but just sharing an opinion based on my experience. I guess my real point was to try it and see if you like it the way it is first.
As for the lever mount, I made my own and posted a thread about it a while back. It was considerably cheaper than the KH although I’m sure it’s heavier.
There is also a Torker DX brake lever mount that attaches to the seatpost.