Get http://web.archive.org/web/20080615203847/http://steroids.fontlab.net/ and run the renamer macro. You have to create txt documents of the from>to names. There is possibly an easier way.
Is there an easy way in FontLab to change (or assign) multiple glyph name suffixes (like glyphname.alt1, glyphname.alt2, ...) to a range of glyphs at once?