[Schroedingersat]

If this is an absolute priority (and it's not, because the costs inuced by theft are dwarfed by the the costs incurred by forced obsolescence) then just have a public challenge-response server with open source code so it can be maintained and secrets controlled by a government department paid for by registration fees.

You have to log ID, provide a small payment and it logs the VIN the item is being tied to as well as having a list of stolen parts.

No anti-repair steps needed so you can stop shilling.