This is a state crime, not federal, so he can't pardon himself as president. I think he could if he was governor of New York, which seems like a long shot.
And New York's AG has seemed pretty keen on seizing his property if he wouldn't pay before. Idk if they can do that for these types of fines but I'm sure they will if they can.
Which, if he's making appeals based off the verdict (thus profiting off a crime), those funds could be seized as well, I believe. (your mileage may vary, check with local jurisdictions for details)
Political campaign donations cannot pay for the Trump Organization’s lawsuit fines and I don’t think they can pay for his personal criminal legal fees.