Ah with more than one person looking, our chances have doubled.
I did write an email to Christopher Franke some time ago but I knew even less about what I was asking for then. So it mightn't have been crystal clear, from my email, what I was looking for.
I presumed at that stage that there must have been a commercial, if small-scale, CD release of that music.
In any event, I didn't get any answer back from there.
The longer tracks are just extended versions of what you've heard from the musicofbabylon5 site but they do have some extra bits in and the length of them makes them useful to listen to while you're busy doing other things.
In any event, 55 minutes of combined runtime is better than 25 minutes