You don't, in any meaningful sense. Even though we do have options to do just that. Simply shunt everyone across one clockwise (starting at Devlin) and switch to a four at the back, taking McGrath or Clarkson off for a right winger in a 4-4-2. We've not tried it with a mixture of Duncan, Hayes, Morris and Besuijen all available, so I don't see it happening with another winger. His go to seems to be a front three, and now that we have a settled defence, his preference seems to be a 3-4-3 as plan B. We've got four strikers, including a misfiring one, to keep happy. I don't see us doing much that rocks that in January and expect a midfielder in the door. Although that could change if he eventually uses the ones we've got properly.
The biggest thing for me this window is that up until this thread I thought we'd signed Dadia rather than just loaned him. That news is like a new signing in itself.