Hi,
I'll send you a more detailed response off-line but the short answer is that I wrote the tunes out using the excellent program Braeburn Music Publisher and it can transpose anyuthing to anything. However, I don't think that I would encourage you to start transposing. Jim Buchanan (last Society Chairman) plays the oboe and I used to play the clarinet and we have no trouble accepting the custom of the 6-finger note being A. Are you really going to transpose every LPBS publication, not to mention the huge resource of Highland material?
You wonder if others would find it helpful to have tunes set in mix.G. I have no idea since this is the first time I have encountered this suggestion.
If you do decide to go down the transposing route, I would offer only one word of caution: make sure that the key signature is correct in the starting material. The Blue Book is deliberately written in 2 sharps as a convenience to our members; it avoids scattering accidentals all over the place or putting a Gnat sign in the key signature - those classically trained would argue that there is no such key. I go into this in more detail in the introduction to our most recent publication 'A New Way to Melrose'. Writing in 2 sharps says to the classical musician that the score is in D. Well, quite a few are in A (mix.) not withstanding the shorthand use of 2 sharps. What this means is that if you transpose down a major second, the notes will appear on the desired lines but the key signature will be wrong (in classical terms). It is easy enough to correct but I tend to the view that it is better to accept the reality that on Border pipes the 6-finger note really is concert pitch A and work from there.
Hope that helps,
George.