Sounds like a lot of work just to save a couple bucks though.

Haptic feedback is a solid idea. I tried a wristband that gave a small buzz when my focus dipped. It was less annoying than sound if you're in a noisy place. Just another option to test.

Can confirm the sharp pencil thing is key... learned that the hard way trying to copy a door trim. My line was so thick I basically just drew a new, worse shape and had to sand down a chunk of wood to fix it. Felt like a real pro that day. It's one of those tools that seems simple until you mess up the simple part. Now I keep a little pencil sharpener right in the tool bag with the gauge.

That's brutal, man.

Sometimes pulling a speaker is the only way to keep a campus safe and focused on school. It's a tough call, not always about fear.