I am a long time user of 1password and I love how you integrated its plugin with Brave. Recently, I have obtained a trezor wallet. And one of the features is a password manager. I think it would be very interesting to have a similar extension to the one you have implemented for other password managers.
Right now they have a Chrome extension, and it would be perfect if you can port it to Brave. (More information here: https://passwords.mytrezor.com/).
I have already checked that Trezor works ok with Brave, so it would be only a matter to port the extension.
Keep up the good work!