This looks pretty clean to me, and could be easily enough done with a drill bit and some BBs. Nice.
Totally agree with a tactile indicator. I've always wanted to address this. I think the answer is sliding an indicator into a slot into a finished knob and hoping that your glue 1) is somehow on the surface area correctly after pushing it in, and 2) doesn't bond until the indicator is perfectly in place, and 3) cleans up nicely.
I want to try that but it'll take me some skill building and practice. My compromise was a raised dot:
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