Librewolf has AppImage on their webpage, too. Does it not fit your use case?

I scream silently everytime.

And then there’s .net classic and .net core. Making up two entirely separate names shouldn’t be difficult for marketing executives.

It should be perfectly doable. The only difference is that the server in on the local network (e.g. 192.168.1.101) instead of localhost (127.0.0.1). You might need to configure your OS firewall to let traffic through.