Well I had a look through.
I am not keen on the Debussy options, but the Chopin Berceuse is very nice, a little out of my level in all honesty, but as mentioned as you can only do 1 piece from each composer and you have max 10 minutes you may limit your options if don't start with the set list first.
Here's some ideas from the setlist I really liked.
Brahms Rhapsody G minor Op 79 No.2
Chopin The OP.57 Berceuse
Rachmaninoff's Prelude op 32 no 5
Ravel's complete sonatine
Schubert's impromptu op 90 no 3
These leaves room for a few other pianists (assuming you like romantic, as I'm not really a classical/baroque fan)
You could look at Liszt, Debussy, even John field has some Grade 8 + Nocturnes which are very nice.
Maybe Debussy's Ballade or Nocturne
As mentioned Check out the Field Nocturnes
Also maybe check out Grieg and Faure.