I've never needed any such thing. Just a good, sharp, drill bit and a little tape on it to gauge the depth and run it by hand after dimpling the spot... screw in the screw and call it done
With all due respect you are over thinking it.
When I am making a body i anyways mark a center line - that gets sanded off before finishing.
Use that center line to mark your strap button.
Heck you could drill for a strap button before you do the final sanding & edge routing.
I actually prefer a tele strap button slightly higher than center line.
It hangs nicer on a strap - especially if it’s a light weight body.