Just anecdotally myself and a few friends used to mod our cars to have 4 to 8 double-pole-double-throw toggle switches under the dash in a metal box bolted to the dash and would secure the wiring harness. Not foolproof but also not trivial to bypass as one has to know which switch goes what direction and it did not cost much. After a while one gets used to fingering the switches into the correct position without much thought. In the incorrect positions the ignition switch is entirely out of the loop. This may be harder to do on newer cars. Maybe a similar yet updated technique could be applied to newer cars?
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Just anecdotally myself and a few friends used to mod our cars to have 4 to 8 double-pole-double-throw toggle switches under the dash in a metal box bolted to the dash and would secure the wiring harness. Not foolproof but also not trivial to bypass as one has to know which switch goes what direction and it did not cost much. After a while one gets used to fingering the switches into the correct position without much thought. In the incorrect positions the ignition switch is entirely out of the loop. This may be harder to do on newer cars. Maybe a similar yet updated technique could be applied to newer cars?