The other thing is: even if a country like the UK committed billions of dollars to joining the fight in the gulf - there’s no reason to think it’d lower their energy prices, or earn them any favours from Trump.
Short of a nuclear strike (which isn’t on the cards thankfully) nothing short of a ceasefire can get shipping moving again. Sending more warships doesn’t help with that.
So it’s not just that helping Trump would be incredibly unpopular at home - there’s also no guarantee the huge expense would lower energy bills at all.