Yes. I did it recently but the way I did it means moving all 300+ websites that I have logins for is now done in seconds.

I signed up for SimpleLogin and a custom domain. I then went around creating aliases for all these sites. Changing the sites is indeed the worst part. Still, this is the last time I ever do it. All my aliases were pointing to my Gmail account. Once I’d finished I settled on Proton. I just moved all my aliases to my Proton email address.

No one knows my Proton email address other than SimpleLogin.

I haven’t but can now ditch Gmail. I still keep the account for a number of reasons but none are for emails.

I’ve also been testing Tutamail. I can get aliases to go to multiple mailboxes. I have the ability to respond to the emails from either Tuta or Proton and the recipient is none the wiser of where my mailbox resides.