Don't crucify me for this but I think Miller could be an option. Ya he has a hiccup every so often with the long ball but something has clicked with him as of late. His velocity is back up in the upper 90's. I really havent seen him throw this hard since he was a starter for North Carolina. He has been nearly un-hittable to right handed hitters and I think his struggles against lefties could be a string of bad luck.
Even if that ^^^ seems farfetched, Its a much better option than giving up key pieces to this teams future for Pap.