I think you’ve hit the nail on the head so to speak…it’s just too small/custom a thing for anyone to have built a dedicated tool it seems. In the end I am looking at using my file manager (nautlius) to automatically run a custom exiftool/bash script on chosen files so I can just click and rename/fix metadata etc as I browse through the files. Probably good enough for now.
Maybe this method could one day be used with open street map