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 It already exists

https://github.com/nickfarrow/frostr 
 No shit. Thanks Ben 🤙 
 Do you know whether an existing key can somehow be converted to a frost multi sig key? Or could be set up as a sub-key of a new frost key which then controls the old nsec? 
 In theory you can split a key but it kinda defeats the purpose because someone will know the original private key. 

You can't use an existing nsec as a sub key, everyone needs to generate keys together 
 Roger that. Appreciate it