I know that feeling! Those very high frets look like they are getting very flat, before you see anything come off the 13th or 10th (depending on what...
It's done, and your approach should work. It's not a substitute for fret leveling, but it can be helpful when you have a single fret--or just a part...
Now that I see it in action, I get it. I also want one ;-) I don't know if they are easy to make, but they look cool and effective. Only a matter of...