This will work unless IPv6 address is used to host any website with TLS - Censys and Onyphe AFAIK already use this heuristics to scan IPv6 addresses already
Discussion
You don't need to bind sshd to the same IP as a webserver or anything else. There are gazillions of IP6's, scanning them all isn't feasible.
On most servers you get a /64, which is 18,446,744,073,709,551,616 IP6s. That's 18 quintillion.