[ProtectOurFreedom]

Depending on your pain tolerance, you can always set up your own private email server. See How to Set Up your Own Personal Email Server by Robert McIntyre. You don't need to run your own physical server, either; you can buy a Virtual Private Server. I've had friends who aren't particularly technical do this.

If you want to offload the pain to somebody else, I understand HRC is an excellent technical resource. For a small contribution to her favorite charity, she might even do it for you pro bono.

[ProtectOurFreedom]

Actually, setting up your own server is a really stupid idea. Stick with ProtonMail.

See Why you shouldn’t try to host your own email by Jeff Reifman.

Forget my original suggestion. It was in jest.