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Both devices (Trezor Model One and Trezor Model T) already support PSBT. However I don't know about good UI implementation so far.
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Next time I have my hands on them I'll test with Sparrow which I know works with Coldcard. Know that design research is in the works at https://bitcoin.design/guide/case-studies/payjoin/
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Which Trezor devices support signing Payjoin transactions (I.e. those having some inputs that trezor will and will not not sign)? They belong on https://en.bitcoin.it/wiki/PayJoin_adoption
HSM mode CoinJoin is a good move. Thanks for your dedication to bitcoin privacy.