There is already a large body of technical exercises for pianists based on common-practice music, such as major and minor scales and arpeggios or the books of Czerny, Hanon, etc. These exercises are indispensable for my own practice of sight-reading, since these patterns frequently come up in common-practice music.
I would like to strengthen my sight-reading of non-common-practice music. Are there techniques that I can practice which distill the "molecules" of the much broader musical practice of the 20th and 21st centuries, to improve my sightreading? Are there specific excercises that can improve those techniques?
For example, recently I have been playing Messaien's Modes of Limited Transposition in all positions on the keyboard.