I looked at it and thought, most of that looks - actually - relatively easy on the trombone. All I need to do is jump from g 4th position, up to g 4th position, then drop back to f# and then it's a straight climb up from b flat to e flat, all within my experience.
How many other trombonists have taken cello pieces and made use of them this way? (I'm aware of the Bach Cellos suites being played by trombone; it wouldn't surprise me at all to find them being played on the harmonica!