China has good enough relations with Iran that they aren't really going to be threatened durably here.

No, China seems to have issues with transitting through the Suez canal all on their own.

Do they? As far as I am aware, the Houthis/Iranians have never messed with Chinese vessels.

The OP is making an Evergrande Evergiven joke

The Evergiven was Taiwanese, not Chinese. Evergrande is a Chinese real estate company with financial troubles, which is unrelated to the Evergiven, unlike Evergreen, the Taiwanese company that owned and operated the Evergiven.

Taiwan, China, same thing. Mainland China is just a renegade province of Taiwan and will be brought to heel sooner or later.