“After years of pushing their proprietary and closed solutions to privacy minded people Proton decided that it was in their best interest to further bury said users into their service as a form of vendor lock-in. To achieve this they made yet another non-standard implementation of something that already existed, this time a crypto wallet." :)
Use addy.io for aliases. Use a different privacy focused mailbox for your mail. I'd advice you to strictly seperate these two things like that so you remain independent.