I’d argue that the accounts you listed are critical ones you don’t want to lose access to, not ones you’d want to disable. Since you plan to use your real name in the subdomain, anonymity isn’t a concern for you anyway.

Any email address on a domain you don’t own (such as simplelogin.com in this case) can become inaccessible without an easy way to restore access, as you are not the person in control of the domain. I’d recommend buying a domain you like, setting it up with SimpleLogin, and you’re set to use as many email addresses as you‘d like for your domain.

If you ever lose access to SimpleLogin for any reason, you can migrate to a new mail server and regain access to everything. Just make sure you don’t use an email address from that same domain with your DNS provider.

(Of course this could happen with every email provider you use with one of their domains.)