Just buy a score in solo tuning and play it in orchestral, just read the notes as-is. It will be in C, the only difference is that in solo tuning the strings are a step higher, but the fingerings are the same no matter how you tune it - think about it.
You will, however, need to transpose the piano part, but that's very simple, it didn't take me very long to do so.
As far as projection goes, solo tuning was necessary in older times because the strings were made of different materials, were quieter, and didn't project very well. So tuning up was necessary to increase tension, and heighten pitch to project better. Now with our steel strings, it is less necessary.
Yes there will also be a difference in sound. It's unavoidable, it will be darker, but still presentable, haha more than that.
What you CANNOT do, is play the piece in D major on orchestral strings. The harmonics and range would NOT match up, and the piece would be literally unplayable.
Hope I've helped some...and to confirm, the piece is 38 measures. It's just slow and in 12 8, so it seems like it should be 76 measures in 6 8, or something to that effect. Anyways, good luck!