If you do not have a 3D printer and CAD software, you are 100% right.

If you already have those things like OP, then why not just design / print one? I am also a 3D printer / CAD person, and I love designing replacement parts that are wither too expensive, or often impossible to find. Mostly though, I design and print things that make my and my families lives easier / nicer / more convenient. And they are customized to the exact item and function, something that you would most likely never be able to get in a store or online.

Stove Knob guards. https://www.printables.com/model/278668-stove-knob-guard

Salt / Pepper Grinder Holder. https://www.printables.com/model/155219-salt-and-pepper-grinder-caddy

Spice Jar Organizer. https://www.printables.com/model/151171-spice-jar-spacer-organizer

Just to name a few things.

Yeah, we had a different stove when our kids were small, and it had the knobs at the back of it.

I think some newer stoves will automatically shut off after a certain amount of time when the gas is on but no flame is detected.

You push the knob in and turn it. The guard goes around the knob, but doesn’t stop it from turning.

And if you need guards for your knobs, I designed some after bumping mine and turning on the gas more than once.

https://www.printables.com/model/278668-stove-knob-guard