Hermit + Coppersmith + cheap non terminal plus buy
Not as powerful as Hermit + Market Square, but still can be very powerful. Nab Madmen, Coppersmith, and cheap non terminal plus buys (Pawn, Hamlet, Candlestick Maker, etc.). Then do a megaturn in which you play several Coppersmiths and your non terminal plus buys. Keep track of how many Coppersmiths you have so that you can ensure you have enough Madmen or villages or whatever to play them all, and keep track of how many buys total you will have so that you can ensure you can buy all the green cards you want. I don't know the optimal play (when to buy a Coppersmith vs. when to gain a Madman, should you be buying coppers, etc.), but I do know it can pay off. As with any megaturn, make sure you can end the game on it. So maybe go for it when opponent has half the provinces and you have at least 2 Madmen in hand, or whatever.
I've executed this both successfully and very unsuccessfully. But either way, it is fun to try, encourages careful deck tracking, and seems underrated.