I'm not sure if this helps, but when I've encountered that problem, I add either: (a) the author's birth year; or (b) just a number, in brackets after the author sort name (but not the author name). So it might be "Bloggs, Joe [1974]" and "Bloggs, Joe [1981]" or "Bloggs, Joe [1]" and "Bloggs, Joe [2]". Not perfect, but it seems to work.
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