Just ship methane. If you have hydrogen it’s not hard to convert it to methane (or vice versa). It actually tends to happen with a simple catalyst near atmospheric co2 and one of the biggest pains when dealing with it is avoiding it reacting.
Which should just add to how stupid hydrogen is. It’s a synthetic fuel that has huge storage and transport costs, is no more green or easier to produce than synthetic methane which we already have. We could just make synthetic methane today if that was the path we were likely to take but honestly it’s cheaper to pump methane out of the ground so that’s what we do (barring any incentives to mix in synthetic methane).
A real hilarity is that hydrogen fuel right now is often made the opposite way. Take methane, heat in absence of oxygen and the carbon and hydrogen seperate. All this talk of hydrogen as an alternative to fossil fuels is nonsense. It’s a synthetic fuel, one of many possible synthetic fuels that’s extremely inconvenient for storage (absolutely can’t be stored in liquid form without cryogenics or ‘bleed off’ to keep it cool), it corrodes fucking everything and best of all it’s no easier to produce synthetically than the fuels we already use day to day, eg methane.
Absolute stupidity and scientific illiteracy that hydrogen was even on the cards.