Israel sanctioned BYD and China sanctioned Israeli cybersec firms back recently to my knowledge. The average Chinese citizen also is much more willing to call it a genocide and if there's one thing the Politburo knows to do, it's not to unnecessarily foment unrest by collusion

I don't personally think it's likely relations would improve on this and I consider myself much better read on the goings-on of the PRC than most

For the other nation states you discussed, I'm far from an expert on them so you very well might be right. But I doubt it'll be straightforward if the US were to cease aid. I also seriously doubt Israel would be so aggressively expansionist without the 300 billion or so they've received from the US. An un-invaded Iraq in combination with Iran would have put its existence at major jeopardy