The Rubinstein staccato study in C perhaps ? Always goes down well and sounds harder than it actually is.In your case, given your creative fluency, could you not just make one up ? I don't mean improvise it but just work it out more or less before the audition and stuff in whatever extra passages came to mind on the day. Or would this not meet with approval ? If they're after musicianship as well as technique it might be just the job.
Kapustin's Eight Concert Etudes Op. 40 - These are brilliant and well crafted jazz pieces with Scriabinian counterpoint. or if you're more daring,Kapustin's Five Etudes in Different Intervals - Think jazz/ragtime with a touch of Rite of Spring.
The Rubinstein staccato study in C perhaps ? Always goes down well and sounds harder than it actually is.
Where could I get these etudes?--preferably for free....