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Georg's script does a much better job than export to ufo.
The foot mark (or vertical apostrophe) is used by FontLab to delineate "Key Glyphs" in class kerning but this system is not used by the ufo type design software so you have to remove them all.
Is there any macro for that?
There is no information about if the class is a left or right class.
You may not deal with right-to-left writing systems now, but you might one day
Of course the whole concept of a “key glyph” for OpenType class kerning in FontLab is flawed, and not a faithful implementation of the OpenType standard.