how to write Vanuatu or muon?

Listening to the radio while driving home this morning I heard there has been a disaster in Vanuatu. How would you suggest writing Vanuatu or, for example, muon? Would you use a joining of the oo hook followed by o, similar to the one in water?

This brought to mind another question: Over the years various diacritical marks have come and gone to indicate the exact value of the vowel circles and to distinguish z from s when necessary. Has there ever been a mark to indicate that a particular syllable is stressed?

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