I like Fournier a whole bunch, I actually think he'd be perfect here. But I don't think Orlando will let a RFA walk. They re-signed Tobias, even though they didn't really want him, just so they could trade him. But otherwise, I think your logic is sound. I would covet Lance Stephenson, but I don't see it. I would covet Conley, but I don't see it.
I'll go,
C: Blatt
1: Brandon Jennings, Grant, Wroten
2: Courtney Lee, Galloway, Vujacic
3: Melo, Lance, DWill
4: Porzingis, David Lee
5: Lopez, Hernangomez, KOQ
I think they'll overpay Jennings, and I do think he kinda wants to be in NYC and get some spotlight and a chance to become a star again. David Lee wants to be back and the Knicks need a real post option off the bench, I think maybe he comes on a slight discount - I think the wild card in the role could be Pau Gasol. Courtney Lee just makes sense to me on some level, not sure why. But we shall see. I think they buy out or stretch Calderon to get some extra FA $$.
That's prediction, not necessarily desired.
Another way I think they could go is to just target Batum and stick with Grant, Wroten, Calderon at PG. They'd probably eventually realize Batum is more of a SF and have to find a SG then though. And they'd go Batum 3, Melo 4, KP 5 at times throughout the game.
C: Blatt
1: Grant, Wroten, Calderon
2: Nic Batum, Galloway, Vujacic
3: Melo, Lance, DWill
4: Porzingis, David Lee
5: Lopez, Hernangomez, KOQ