Hi Kathy,
That's a hard one to work with as SubjectsPlus is currently coded, because of the way the URL is reassembled (and not just prefixed and/or suffixed).
Without tinkering with the code, the simplest solution is what you came up with at the end. We're super busy at SP HQ, but it would certainly be possible to make a function to take the URL from the location field in a format like
and then pull it apart with regex (or however) and reassemble according to your pattern. It would be a few steps to do it properly, though, since we'd have to have a flag to choose regular or WAM-proxy, and add the two pieces of your localization ("
http://0-" and "
arthur.searchmobius.org") to the config file, and then find the right place(s) to capture the location URL before it's displayed, since it can't work as a simple static prepend from the config file. This is pretty core functionality so it's not a simple addition.
Anyhow, if you want to add this as an issue on GitHub, we can consider it for a future development sprint, although I really can't promise it would be anytime super soon.
Unless someone else on the list has already come up with a different solution?
Andrew