Playing Sound of Music with just one trombone

I'm now doing my second run of the sound of music as a single trombone in the orchestra. It is scored for two, plus the tuba.

I suspect that, more often than not, orchestras will do it this way. The second bone part and to the tuba part aren't exactly superfluous, but it is reasonably easy to cover all the best bits with one instrument. (As long as the instrument is a large bore symphonic horn, that is. Also presuming that there is someone playing the trumpet book. There are several spots with unison trumpet and first trombone, and I've tried to avoid those, opting for harmony parts instead.)

There really isn't much of any interest in the tuba book, but here are the numbers where I've been playing second instead of first. 

6. My favorite things - m167 to the end

21. The grand waltz

24. So long, farewell - play cues at m93

28. Climb every mountain - m28 to the end

29. Entr'acte

32. Reprise: my favorite things

37a. Processional

37b. Canticle (if nothing else 37a and 37b are crucial - and fun to play)

46. Finale ultimo

47. Bows - m53 to the end