I'm not sure how neoclassical Koechlin is
I listened to Martinů's Double concerto for two string orchestras, piano and timpani a few days ago (after having heard it once [and for the first time] over 6 years ago), and I really enjoyed it.Wouldn't it be more appropriate to classify Hindemith as a neo-baroque composer, given the polyphonic nature of his music?
Speaking of Bentzon, I have really grown to enjoy his Partita, Op. 38, which could make a great coupling alongside any of the Bach dance suites or even alongside some Hindemith. I have usually found a lot of Bentzon's music cold (just my personal opinion), but not this work by any means. It is a work that definitely deserves more performances.