FYI if you use your country ccTLD instead of .com, the agency in charge will help you recover a domain even if you lose access to your registrar somehow. Just make sure that your whois is always accurate (whois is rarely public for cctld, no reason to put fake info).
Not the previous commenter, but I do a similar thing. I have a (promised to be) lifetime email address through my graduating university that I use as the domain registration. It's been good for over 20 yrs now.
I don't know the setup at your graduating university, but I am aware of some universities who are just now starting to rethink "lifetime" alumni email. They are using email service provided by Big Tech and the reason is simple: Big Tech is starting to charge more for these email accounts and once that starts happening (which it is), the universities can't afford to offer many thousands of alumni email accounts anymore. For those universities that have gone with an authentication vendor (including two-factor providers), the costs are increasing for that too.
They are on Microsoft email now and have been for probably ten years if I remember right, so I will have to keep an eye out for that. Thanks for the heads up. When I was there it was their own POP/IMAP/SMTP server.