Comment by anonymars

How about actual switch covers (and switches that are not located right in the same area as stuff you are using routinely) instead of a glorified detent? Though I suspect this would also succumb to muscle memory

What about up on the overhead panel where the other engine start controls are?

Or (at the cost of complexity) you could interlock with the throttle lever so that you can't flip the cutoff if the lever isn't at idle

Also the fire suppression system is a different activation (covered pull handles I think)