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 IIRC at one point OpenTimestamps had code that would embed a hash into a bare pubkey in a multisig by grinding the hash until it happened to be a valid pubkey.  
 I guess if anyone should remember that, it'd be you  :)

Or was it Ricardo? Stretching my failing memory here ... 
 If that code does in fact exist, I almost certainly would have been the one to write it. Ricardo has does a lot of work on OTS. But not that part of the codebase.