Opening Piece from Glassworks by Philip Glass has 2 vs 3 throughout. The notes are very simple to play and for an intermediate player this would be a pure 2 vs 3 exercise.
Or you might try a short passage from a piece, e.g.
Rachmaninov 1st piano concerto 2nd movement, e.g. the 8 bars starting around bar 30 are 2 vs. 3 and in my view playable by an intermediate player,
or Beethoven Sonata in F Minor Op 2 no 1 around bars 168-172
you could probably just loop round either of these to make it into an exercise.