First of all, Chapman is rightfooted. He's only just come back from injury so the demands of playing LWB would probably be too much for him, especially as it's a position he's not accustomed to.
I don't know what others have said but from what i have SEEN, Chapman has basically been the understudy to Duffy, playing in the positions Duffy usually fills. You wouldn't want Duffy at wing-back so i don't see how playing Chapman at wing-back would work.
However, i do agree that JOC should probably fill the spot, not a bad option bringing Wright in, not bad at all.