Thank you all for the input!
Grizzly:
Shifting the tuning, i.e. moving some notes from the top to the bottom is certainly possible. In that case, one should of course adjust the notes at the ends. I've done this in changing the two G#'s at the ends to a G and an A, as these notes are more useful to me than G#'s.
If I understand "swap slide-in for slide-out for both blow and draw" correctly, that is to simply, physically, put the slide in upside-down. I attach the corresponding note chart for this configuration. Is I briefly mentioned in my last post, this is how I normally play. I've appended a chart for this!
As for the key change you suggest: This would give the good keys Db, Ab, Eb, Bb and C. (A good trick to remember this is that these are the keys between the two blow notes in hole 1.)
I would label your transposition as being in the key of Db, after the flattest key. The one in my diagrams I would call Bb harp.
JB:
Thank you for your kind words!
Regarding your observation that this tuning seems limited to a few scales, I'd have to disagree though.
You are right in that this tuning has a few scales that are more comfortable, but even a person who only want to play easy keys could get by with two harmonicas since these "few" constitute 6 of the 12 scales.
Also, to get a fair comparison, you'd have to consider the more awkward keys of standard Solo tuning. I've not been playing Solo that much, but keys like D or A major seem HARD. There is no apparent underlying logic, except trying to think in terms of a C major scale with a number of sharps.
In contrast, what I call the "awkward" keys of my tuning (Eb, Ab, Db, Gb, B and E) follow the same logic as the comfortable keys! You just have to use an additional combination of the rules (release the slide and move one hole to the right to move up one half step) and keep track of the "boundaries" where you need to change your direction of breath.
Of course I'm biased, but in my opinion the hardest keys of my tuning are much easier than most keys on Solo.
Streetlegal:
That scale is very playable indeed! The corresponding scales in my diagrams that are just as easy, without any slide work, are Bb, F, D and A. I've appended a phrase map with some slide-less major and minor scales! If you like blow notes, have a look at the G major scale, and maybe the C major one as well, in my charts. You'll find they can be played with only one note each as a draw. Tunes in the G and C major pentatonic scales can be played with only blows!