This isn't the hard part of self-hosting, at least not anymore. In the comments here there are lots of examples of similar projects that solve basically the same problem (app selection and deployment). To make self-hosting "easy" we need to solve domain registration, DNS management, and port-forwarding configuration.
This probably requires a project more like OpenWRT that includes an API-driven relationship with a registrar. The lack of a standard (consumer accessible) domain registration API is a huge hole in automating this. If such a project gets some traction, then it could migrate to a physical router that prospective self-hosters could buy. With domain registration, DNS management, and port forwarding all in the router's software, then the remaining hard parts can be sufficiently automated to make self hosting accessible to the average gaming console owner.
This probably requires a project more like OpenWRT that includes an API-driven relationship with a registrar. The lack of a standard (consumer accessible) domain registration API is a huge hole in automating this. If such a project gets some traction, then it could migrate to a physical router that prospective self-hosters could buy. With domain registration, DNS management, and port forwarding all in the router's software, then the remaining hard parts can be sufficiently automated to make self hosting accessible to the average gaming console owner.