I'm sorry I don't quite understand your situation. Is it a showcase OR an audition for 'international' schools. I appreciate you don't want to play something thats been done for the last 5 years!
Is it only pianists playing or are there instrumentalists from other genres represented. I only ask because if its open to all instruments you really want something that stands out as being totally pianistic, the Ravel would be excellent in this respect and it is a very fine piece and allows you to show technique and musicality in quite a concentrated time frame.
If you are looking for something about that time frame Liszt's Jeux de eau de villa d este is also very good as are any of the petraca sonettos for the Italian book and I think they would match what you describe is your temprement (nos 1&2 are more technically weighty than the third one but all are very beautifull pieces!)
If you have lots of violinists and cellists playing unaccompanied Bach I would avoid the English suites. I am a huge Scriabin fan but I'm not sure that the LH nocturne is his best work really and as I said before something which capitalizes on the fact that you are a pianist and not a cellist would be the direction I would take. Do you know any of his Impromptus or even his Fantasy in Bmin (hard but worth learning)
Another wistful piece of Ravel (as you seem to like Ravel) is Oiseux Triste from Mirrors, a beautiful piece and a really good calm start in that piece is SO impressive it takes the audiences breath away.
I personally would play Jeux d'eau. Or Toccata from Le Tombeau de Couperin would be also a good piece for displaying your skill only if you have already mastered it.