It is not well known, but you can perform a collaborative ECDH with the key shares. I have an example in the @cmdcode/frost library.

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Ah hah. Earlier I tried 0xchat when logged in via nsec.app bunker, no go for redeem, but revert to nsec and all good—so what you said tracks. Wonder if a collaborative ECDH via Frost would do it? nevent1qvzqqqqqqypzqs3fcg0szqdtcway2ge7zahfwhafuecmkx9xwg4a7aexhgj5ghleqqsdfqyp8nwk9mypej2xvys3uhf05w98dujj6fjnz4nflm969czc0nsh49klp