I mean ignore them. The court may have the power to say the constitution prevents one from cutting a time frame short, but if a law or EO says a certain thing will be in force until a specific date, the court has no constitutional authority to decide the date should be moved to a later date.
It’s completely outside the scope of their authority and can be ignored.
So could all the other unconstitutional orders, but they won't be. The President could instead just enforce any of the several hundred laws against illegal aliens that already exist.