Given that a prime controller is really just a private key that lets you stake higher, how can you gift it to anyone? You can give them a copy of it, but how do you un-learn the private key?

And rather than all this scraping, burning, etc. why not just remove the private key from your wallet's config file. Then you won't be staking with an unfair advantage and won't have to worry about how to dispose of the ill-gotten gains.