@evan I'd suggest instead a much more poetic move: Grab the US Virgin Islands, and hand them back to their former sovereign, to become, once again, the Danish West Indies.
Why would that be especially poetic? Because the USA specifically agreed in the Senate-supermajority-approved Treaty of the Danish West Indies (1916) to acknowledge Denmark's sovereignty, in perpetuity, of... Greenland.
If Mr. Trump thinks he can override without Congressional consent an Article II treaty (well, two if you count the North Atlantic Treaty of 1949), well, at minimum he should expect the reversion that happens when that treaty goes away.
Perhaps then, Mr. Trump can visit Charlotte Amalie, Sankt Thomas, Dansk Vestindien, and ask permission to apologize and retreat. If they'll grant him a visa.