gm, turns out Trezor and Ledger don’t currently support signing authorizations, let alone transaction type 4.
Afaik, they don’t have plans to - we at Ambire contacted Trezor recently and it turns out we’re the first team to bring this to their attention.
It would help if more wallet teams here who plan to support EIP-7702 request this feature from Trezor and Ledger, so that they can adequately prioritize this and don’t think it’s a niche EIP.
Furthermore, both teams told us that they’d only implement such a feature if they had an allow-list of audited designator contracts, which is also something we need to work on as a community. Has anyone started working on this?