rich1.0nick (npub1j8…g26k2)https://yabu.me/npub1j8d6h8mzvc8f2fvysrf09nlkmn7m2ylj32zl5na4tm5e8fd5dqysrg26k2njumphttps://yabu.meYou can't really take an existing secret key and "join" with that key being your secret share in FROST. Your secret polynomial is only an input to key generation and not what you sign with. Undertaking key generation with the other parties will give you a secret share that depends on their (and your own) contributions