Sodium Silicate in the crankcases should do just fine.
It’ll seize the bearings in just a couple of minutes. Engines won’t be good for much but scrap afterwards.
That is what I would do. Wouldn’t put up with the crap for five minutes.
I was thinking computer program sabotage. ‘tis the modern age after all. You screw up the computers and not much will work. (and maybe my buddy, Spartacus, sent an anonymous email suggesting that)