How do I add coyote time if I'm using jump sustain?

I have a precision platformer I'm making currently, and the only thing wrong with it is that the jumps are too difficult, and I've been looking into this but cannot figure out how to do it with jump sustain too, any ideas?

Here are two examples:

dropbox.com/scl/fi/n64iaa0ryra0d1hdmskuj/CoyoteJump_wsustain.c3p

dropbox.com/s/8ijtgxoljyzyc6t/CoyoteJumpWithSustain.c3p

If I also may add, I've used these and my only gripe is that moving vertical platforms can't be jumped from, specifically when moving up. Any idea to get past that?

specifically sine-based moving platforms.