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I don’t think you understand the purpose of a trezor. It forces you to manually sign/confirm every transaction. you want to automate that by requesting a feature defeating the purpose of the device?
The only solution that comes to my mind is to create a smart contract that does that. Since you offered to develop some part of your feature request yourself, that should not be an issue for you. maybe you could open source it, so others can use it too, that would be great 😉