If he is shipped to the Knicks, which is NOT going to happen during this season, by the way, and I know that perfectly well, he just won't play, say bye to the folks in the US and come to Europe.
He can find 2-3 teams that hire him for 4 millions for the rest of the season.
Euros, not dollars.
The only way he could end up in NYC, actually, is as a free agent, if
1) Cleveland looses the le, hence James goes to NYC.
2) Cleveland wins and NYC gets Wade AND Bosh. In that case, he is interested and the Knicks are interested.