I'd like to try Piper Up front in a 4-4-2 scenario. Kosta feeding off him because he's a big lad. Reminds me of a Keegan & Toshack pairing. I've seen Piper shooting at practice and he's not too bad at all.
I think with time he will iron out his defensive errors a bit too, it is still a fairly knew role for him in defence and especially at this level.