Conceptually its doable on linux and ipv6. Have the listening program sit on that default port of 80.

Something involving socat, an any-IP / TCP routing rule, a VPS or other machine with a ipv6 /64 and plenty of duct-tape.

You'd get an application sitting on port 80 accessible via some unique ipv6 address (in the /64) on a tcp port 80. They needn't be the same port number but it would make it easier.