Beetle, I do recommend coming as close as possible to the original value, since that affects frequency balance and phase addition through the crossover. I am a big fan of double-bypassing and like your idea of adding the third cap to hit 27.93uF. That 0.33 cap can be ultra-quality which keeps the razor sharp leading edge transients from smearing.
I think that your first proposal built on CSAs is a better idea than the 0.01uF ultra with the SAs. CSAs seem to be a big step up from SAs, which were ClarityCap's best in their day.
If you do this mod, I would appreciate you modifying one speaker and perform whatever comparative tests you can between old and new. We can build a knowledge base here on the forum for the benefit of all, including yet to be identified upgraders everywhere.
I think that your first proposal built on CSAs is a better idea than the 0.01uF ultra with the SAs. CSAs seem to be a big step up from SAs, which were ClarityCap's best in their day.
If you do this mod, I would appreciate you modifying one speaker and perform whatever comparative tests you can between old and new. We can build a knowledge base here on the forum for the benefit of all, including yet to be identified upgraders everywhere.