Why not play the pieces that want Eb, then retune and play the ones with D#? That doesn't take long with a 2X8.
> From those pieces I got the notion that the note E flat had a special
> meaning - it appears at just those places when you might want the
> audience to sit up and take notice. The idea could have been just a
> by-product of temperament (mine) with that note being compromised
> between a proper D# and Eb... chicken and egg. If you want to play
> through the whole book, leaving aside the clearly organ toccatas, that
> is the one choice that must be made.
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with obvious corrections.