I do something something like this using wildcard certs with Let's Encrypt. Except I go one step further because my ISP blocks incoming data on common ports so I end up using an uncommon port as well.
I'm not hosting anything important and I don't need to always access to it, it's mostly just for fun for myself.
Accessing my site ends up looking like https://randomsubdomain.registered-domain-name.com:4444/
My logs only ever show my own activity. I'm sure there are downsides to using uncommon ports but I mitigate that by adjusting my personal life to not caring about being connected to my stuff at all times.
I get to have my little hobby in my own corner of the internet without the worry of bots or AI.