Prokofiev 1 is probably the easiest of the 5.
Why not one of the Mendelssohn single movement works - there's 3
Rondo Brillante Eb (is fun to play!)
Cappriccio bmin
can't remember the last one
There's the short Liszt works
Totentanz

Hungarian Fantasy might be a better option
Chopin
Polish airs
Rondo for piano/orch.
('la ci darem' vars might be too long)
Schumann
There are a couple of works besides the concerto which I don't rememberthe names of.
Mozart
There are 2 rondo's which are short - Amaj and Dmaj
The Rimsky Korsakov concerto is short although I don't like it.