Looks like you're serious about this.
In my prior post, I mentioned an inexpensive sight pusher I bought on Amazon. It works well, but it takes a lot more time to get the slide shimmed up to the correct position than it does to actually drive the sight out.
I cut and grind some aluminum shim stock to get the slide positioned correctly. The shims have to be sightly narrower than the slide width, and still allow it to support the slide when cranked tight. You also need the correct height to allow the pusher tab to ride just above the dovetail, and contact the sight fully. This is time consuming, and I do enough sight swaps to make me decide to look for a better way. Not $400 worth, but better than the cheap one I had.
Here it is:
https://www.midwayusa.com/product/1017290319?pid=354154
Very reasonable price for a quality pusher, and it adjusts perfectly in seconds. Makes sight pushing a piece of cake. No annoying shims to deal with. Graduated markings show how far you've moved the sights too.
Make sure you cover the slide with masking tape at any contact points to protect the finish. I even cut a piece of tape and stick it to the sight where the pusher contacts it.
If you're concerned about any marks on the sight, a cheap Birchwood Casey bluing pen will take care of it.
FWIW, I've found Kahr sights to not be any tougher to push than any other brand of pistol.
Good Luck - hope this works out for you.