Stephen Chatman:His collection entitled Sports is a growing favourite among students. Lots of non linear pieces, graphic scores, tone clusters and forearms. https://www.drstephenchatman.com/works.html
K.S. Sorabji- Opus clav.Finnissy English Country Tunes
You forgot Xenakis Synaphai and Finnissy Folklore.
Finnissy Folklore, sure - but Synaphai is not a solo piano work (which is what I think is supposed to be recommended here). Anyway, why not Finnissy Piano Concerto No. 4 and Sorabji Concerto per suonare da me solo? Each will fit into a single half of a conventional length recital programme and the former could be paired with other works in the same half.Best,Alistair
Sorabji has some not that difficult compositions, correct?
He wasn't asking for accessibility, but rather something that is a bit easier. See my suggestions earlier in the thread for reference. And Sorabji isn't avant-garde.
Would something by Nono work?
Well, are there any easy piano works by him? All I have heard are difficult works by him.
the noisier the better! recommend composers and specific pieces, please!