Perhaps more surprising to many, front bags were more aerodynamic than
rear ones. A handlebar bag was more aerodynamic than a Carradice
saddlebag that extended just slightly beyond the hips of the rider.
Front panniers (on low-rider racks) were more aerodynamic than rear panniers.
Eds love of bar bags is on the money though.
A small cleverly placed bar bag might make for way around the no aero bars rule.