Don,
No, thank you. This is some deep stuff here; I’m surprised no one’s replied yet. Keep it up! Don’t get writer’s cramp!
In using 4ths & 2nds you’re logically mirroring aspects of the original melody, and of Coltrane’s solo. The first two bars of his solo are what? Simple arpeggios, no more, and in proposing "pretty," clarity-inducing 4ths or 5ths, as an alternative to knotty chromatic lines, you’re doing what the man himself does through 13 choruses.
When I was looking for new ways through Donna Lee, to use your phrase, at some point I realized I could try stealing wb lines directly from Jaco's solo, instead of from bass transcriptions or my own feeble ideas, with the basic "exchange rate" being his 4 notes = 2 of my wb notes; I then tried applying this to Giant Steps, scratching out wb lines from his solo lines “divided” by 2, cherry-picking my way through the measures. I did the same with that wonderful Joe Diorio book devoted to Giant Steps; pilfered - I mean reconstituted - all his guitar lines!
And you’d better believe I wrote them all down; Giant Steps is relentless.
To the extent that my objective is also to feed licks and melodic riffs to the soloists as well as propel the thing along, exactly how melodic can I be at 286 bpm? Answer: not much; hence a fallback to using your wide intervals. It’s my experience that soloists can react to an interval jump like your mm 1 of étude 1 more easily than a rumbling chromatic line.
Probably not news to you, but I see Central Park West as the ballad-tempo analogue to GS and a way to “pre-teach,” as they say, or introduce students to
the real thing or look at GS from another angle.
Hope this is somewhat coherent . . .