You will be killing more expats than emirati citizens and will surely anger the countries whose citizens were killed such as India, Pakistan, Bangladesh and might even kill more Iranians than UAE citizens. UAE would retaliate with cruise missiles and besides Saudi Arabia is developing ballistic missiles with Ukraine that have a cep of about 30-50 meters which in theory they could retaliate with. Unpopular opinion but I do think UAE could take and hold Abu Musa by coordinating their forces to firstly strike Iran's 7 air bases near on and near Abu Musa. Secondly, attacking strategic targets in Abu Musa. Thirdly, attacking ships based in the strait of hormuz. Fourthly, using landing craft carrying about 6000 troops to land the troops, SAM, and armored vehicles. Iran might try to retaliate but they would be risking striking their own citizens if they launch ballistic missiles. Air superiority would already be achieved so I don't see any viable options for Iran. You can disprove me however you see fit but this is just my opinion.