Yes, I also had DDG email protection service, until they did some questionable things with search results that revealed more about what kind of company they are (though I still subscribe to their newsletter), but no longer use the email protection nor search engine.
However, I think you have a good idea.
There are alias services that would work, but they do not track for protection from what I understand. Protonmail offers one or two additional addresses, and all the mails that are sent to your inbox are tracked. I long for a shorter domain from Vivaldi Webmail (such as @ vm.net ), but I would think a feature to track all incoming mails would be the best solution. Then you can use whatever address you want to have mails forwarded to your inbox.
That's my two cents.