Not sure I can get on board with this 'Harris as a winger' notion. Where has it come from? Because he has pace?
Call me old-fashioned, but I expect my wingers to beat a man - as Mills, Edwards, Murphy, Tyler and Browne all can (as long as Browne remembers to go around the defender rather than trying to run through him).
Mark Harris is undoubtedly quick, is fit, and works hard. But I don't think that equates to a winger, or variation thereof.
That said, I still see a place for him in the squad. Imagine we're 1 up at home to Pompey, we're tiring, they are starting to dominate position playing out from the back - on comes Harris to press their defence, harrying, defending from the front, pushing them back - he might win a free kick, a corner, maybe even get a goal.
But I'm not, on the evidence of this season, in any way inclined to shoe-horn Harris elsewhere into the starting XI in order to try and kick-start his season.