Few things:
- I'm curious about the bends or glissandos in M. 2 & 4. They're definitely bends according to the original, but I'm not sure how they're supposed to be executed on the piano or if they're appropriate for piano solo music.
I can't say that I agree with the bolded part of your statement when this same website has music that has percussion or vocal-noise instructions, so saying it's not appropriate is inconsistent with the acceptable ways to write music according to
this site, and also I have seen solo piano compositions with instructions that call for the player to lay their forearm down across the piano keys, so I think it's also unfair to say it's inappropriate even if you're referencing literature outside of NSM.
That said, if you have a better suggestion to notate it, I am all ears. It's just not really very helpful to say you don't think it works and leave it at that.
The others I'll fix when I fix my laptop tomorrow.