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@polybikeuser
Henry James, one of the big US suppliers of frame building bits fabricate horizontal dropouts specifically designed for retrofitting to geared bikes with vertical dropouts, you can see them here. They're cut with longer seat and chain stay plates, so that you can just cut the old dropout out and cut a fresh new slots for the dropout, instead of debrazing the old dropout and cleaning up/botching the old slots to get the new dropout in.