Since some time i was thinking about a VP card that would trash Provinces from the supply on gain. I'll just throw it in here, though it's probably not very good.
Something
7(?)$, Victory
Worth 2 VP + 1 VP per Province in the trash.
When you gain this, trash a Province from the supply.
Nice in games where you don't get 8$, but often 7$. First one is a Duchy, second makes both worth 4, third makes them worth 5, 4th, half in a 2-player game, makes them Provinces. Does/doesn't help with the Province split. Maximum points with two players is 8, with 3+ it's 12. unless somebody buys Provinces faster...
Edit: Well, maybe it's a 8$, which changes a lot.