Rob, from your selections:
2. Bowen's Piano Sonata No. 6, last movement.
3. Ginastera's Piano Sonata No. 2, last movement.
6. Weissenberg's Sonata en état de Jazz, last movement.
Not sure about the others.
#1 is by an early 20th century Swiss composer, and #4 is a reduction of a symphony.
The only Swiss composer I know off the top of my head is Frank Martin, but I don't remember seeing that in his works anywhere. For 4, I'm just about clueless, but I'll keep thinking.