Binding only to specific network interface

If you are taking about the web front-end it is definitely possible. It was a configuration error on my end. See: Binding OH3 to selected interface(s)

However when I read your post I think you’re not talking about the web server!?

Correct. I don’t even really care if the webserver binds to both addresses because I don’t need port 8080 for anything else. I just need OH to stop grabbing port 1900 on one of both addresses. I don’t even know what part of OH does this because I have neither Hue Emulation nor the UPnP Binding installed.