An option would be to remove the reset button but keep it handy (in the
ashtray). This would keep others (kids, borrowers) from fiddling  and act
as a reminder for the owner.

Could be used in conjuntion with the sticker.

OR a proximity sensor could be fitted to the knob, so that when a finger
approaches it whilst the vehicle is moving (wheel sensors) a prerecorded
message comes on to say "Uh-uh-uh-uh-aah! Don't touch that!"

Andrew Grebneff
Dunedin, New Zealand
VW & mollusc nut
1984 VW Type 25 Caravelle (currently SVX engine; waiting for a Porsche trans)
1986 CE80 Toyota Corolla 1.8DX diesel (extaxi)
1989 CE96 Toyota Corolla 1.8DX diesel wagon
1989 CT170 Toyota Corona Select 2.0 diesel (taxi)