The second (or third?) time somebody asked me if I knew how to batch-replace (or add, or remove) the suffixes on a set of glyphs in RoboFont, I sat down and wrote a little script for it. Here it is, in case somebody else finds it useful: more info (tool page), direct Github link. It was a useful and fun little exercise; inter alia, I learned that the plural of suffix is, in fact and somewhat disappointingly, suffixes.