Email aliases , pgp and e2ee

With proton you get 15 account email addresses. Those each get their own PGP key pair automatically and support for WKD. You can set them up here Proton I haven’t looked for or needed a tool that does aliases and PGP. You can use GPG or Openkeychain to generate key pairs, then you need a way to give your recipients the public key and your email client to be able to decrypt. Could be possible using proton bridge and Thunderbird. Seems like a lot of work and easy to go wrong. Honestly use the 15 different account addresses or just separate accounts.