I usually face this problem when I come across HTTP links. I have a HTTP proxy setup but due the nature of HTTP, this is only truly function for minimal, text-focused pages. I would prefer launching my browser, as specified in the [url-handlers] section for links that have content that doesn't fall into this narrow criteria.

I think the best way to handle this, if you're willing to consider it, would be to add new keybinds for "open with proxy" and "open with URL-handler". An example would be if I'm over a HTTP link, I could press Ctrl + P to open it with my proxy and Ctrl + U to open it with my URL handler.