If I were Iran (I’m not, ftr) and China (also not), I would only offer safe passage to ships flying non-US-buddy flags and insured by a Chinese shipping insurer. In turn, the Chinese insurer insists on indemnity from sanctions until the Iran situation is concluded at the UN, to restore worldwide economic stability.

Safe passage for the rest would be pending the ceasefire & reparation negotiations (to be held in a public UN forum in NYC).

I shudder at the thought.