If the options come down to letting Jalen Brunson walk to the New York Knicks or overpay him, the answer is to overpay him. If Dallas is a serious organization with championship aspirations then the only recourse is to pay market value. Even if the market is being set by Jalen’s dad and godfather.
A lucrative sign and trade to New York is not happening. It’s been detailed how difficult that is to do here, but it’s worth repeating that a sign-and-trade is an extremely low probability given the Mavericks cap situation.
I’ve seen people posting potential sign-and-trades where the Knicks give the Mavericks good players and picks.