Slideless chromatic tunings are tricky, especially if you want them to be regular
I think I've managed to prove mathematically the following: (If anyone wants the proof I could try and put it in a readable format, but that might take some time.)
If you want exactly two patterns to play any 7 note major scale, and don't want any repeated notes, your only option is to make C, D, E, F#, G# and Bb blow notes and C#, D#, F, G, A and B draw notes, or the other way around.
Further, the notes must come in this order, and the only room you have for variation is shifting the one of the plates left or right.
Having only two patterns thus forces the regularity upon you!
Shifting the draw notes one step to the left would solve the problems you mention with closeness-of-pitch-induced fatigue, and would make room for a LOT of bending. In fact, every note would have a bend enharmonic, and would be available as a pure note OR a bend!
Take a look at this:
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Blow: C D E F# G# Bb C D E F# G# Bb
Draw: Eb F G A B C# Eb F G A B C#
The drawback of this shift would be that, if you require notes to be played without bends, some already huge jumps would be even huger. Jumping from a draw G up to a C is a three hole in Bob's proposed tuning, and a four hole jump in mine; too large for such a common interval!
With good bending control, however, you could instead play the G as a bend down from the A, and the C as a bend down from the C#. This reduces the whole thing to a 2 space jump! It just strikes me that if you set this up well enough for overblows, you could even play the C by overblowing from the B, a one
space jump!! With these techniques, each pair of holes cover half an octave, and the overlapping holes would offer a bucket-load of possible ornamentation.
This still would be a tuning that requires a lot of jumps, but it would retain Bob's Property of requiring only two patterns to play any scale.
Easy patterns, totally regular with legato stretches in any key, large bends and lots of room to explore for the advanced player. I kind of want to see this built