Since most wallets don't know how to handle oreimages well, I would go for a DM to the zapper that contains the decryption key for the content.

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* Decrypt content with key x, publish as kind 1337

* When content receives zap, send "DM" to zapper with x with kind 1338

* Zapper decrypts content

Kind 1337 would have a decrypted tag and an plaintext Tag as a teaser, and a tag for the price for the decryption key.