Fly in echelon, and if you position your view right you should be able to keep the HUD in one side of the frame and your form buddy on the other in 16:9.
Seriously though, invest in TrackIR as soon as you can. It's a life changer, and i can't imagine doing air-to-air without it. I did A2G in the Hawg for a year or so without it; it's doable but DCS is much better with it.