Against fake information, facts: Netherlands is not paid by the US. NATO does not mean ownership. There is an US base in Greenland that is leased, like many others.
I mean a dumBAss plan. From the point of view of Denmark, the legitimate state that includes Greenland, it is likely that selling territories is not in the agenda and it is probably illegal to start with.
Trump will probably create a MGGA movement, start tweeting disinformation and play all the cards in the Neo-Fascist inventory. However he may find that the average European is vastly more educated in politics that then average american and they simply may not want to be caught in the middle of the future Chinesse-American war.
Trump's plan is to hold chokepoints all over the world to threaten China with economic collapse. It is not a bad plan but as usual, Trump is the wrong person to implement it.
BTW, there had been more ambitious plans... https://en.wikipedia.org/wiki/Project_Iceworm#:~:text=Project%20Iceworm%20was%20a%20top,could%20survive%20a%20first%20strike.