Well we're about to find out how much of this supposed fortune is held in accurately valued, easily liquidated assets because Engoron should be delivering his verdict imminently which could add something in the region of $250-350m on top of the $80m he owes to Carroll.
So that's up to $430m he's going to have to pony up. And if he wants to appeal, he has to place 111% of verdict value into escrow. Yes, that means if he wants to appeal then he will probably need to find half a billion dollars... pretty much immediately. And he can't squirrel things to offshore funds as he's now under the close inspection of a court monitor.
There is no way he can access that money through legitimate means. The clock is ticking on the next Trump bankruptcy.