^I agree with Powerman. Player 2 has no reason not to buy the penultimate Province. If he's close as you describe, he should buy it, and if he's not close, then he needs both Provinces anyway and should buy it. Player 1 then has no reason not to buy it, since if player 2 can buy it he will. If player 1 doesn't buy it, player 2 can just buy it with no fear of missing out on a last turn.
The PPR works now because no one wants to buy the PP. If you make it so that it is okay for one player to buy it, then the whole thing falls apart.