Have you considered bundling support for tinyweb protocols like Gemini and Gopher? Those will work with full fidelity over the kinds of connections you’re focused on, and the core Browsh features allow you to jump from Gopherspace/ Geminispace to www without leaving the terminal.

Maybe the smart way to do this is to add Browsh as an optional dependency to a terminal-based Gemini client… the proxy architecture would add overhead if you run the whole thing locally though. I can see preferring to have a SSH connection from the client to a master proxy node that handles all protocols.