Would love to hear it recorded with all the "treatment".
I assume you mean live? Or just with a better sound mix?
Live would be great. In real life you'd possibly go with a mixture of sequenced/live, with the whole thing mixed by an experienced engineer. You'd have a midi mock-up to get the go-ahead from the director and other powers-that-be, then, depending on budget, you'd possibly overdub some live instruments where there'd be some sort of tangible benefit. Of course you want your music to sound as good as possible, but you
particularly want that to be the case if there's any possibility of the soundtrack being released on CD or whatever ... without dialogue or sfx to cover musical shortcuts! Ditto if the music (alone, unsync'd) is going to be part of your portfolio.
For me, first cab off the rank would be cellos – they're a bit exposed and sounding iffy at 0:45. Three players with overdubs – or "that was good but I think there's a better one" overdubbing on the sly ...
. (Two players never play in tune with each other, so they tend to perform awkwardly even if the line
is to be overdubbed. One player: ditto with him/herself in the cans.)
2. Possibly the flute/panpipe/? solo, although you might want an "exotic" sound which could be easier to get out of a computer than to record live.
3. Possibly french horns for some of the low, mean-sounding lines at the beginning. Also for soft pads under the piano at the end. Horn timbre changes so much between pp and ff – and then you've got their various effects: stopping, sforzandi, rips – very difficult to fake if they're going to be featured. (Just don't mic them up the bell!)