Problem is that the empire's control over Gaul is extremely loose anyway.It is far more important to consolidate over what you can get definite control over rather than care how places that you have very little control over feels.In other words,you can't get shit done if your house is on fire.Before Majorian,and after him as well,the empire's connection to Gaul was basically cut.The entirety of Hispania was lost to the Barbarians.What is important is to get a loyal,sustainable military force.Not enough manpower or clout to get away with that. Without Africa the WRE doesn't have the monopoly on force to pull off such a maneuver. Plus it alienates the elites in Gaul and Pannonia who would then chose the Barbarians over the government in order to safeguard their lands.
As well, it likely would be very difficult to do. Elites were already shifting to private militias and other forces to protect their land, in a very crude and primitive form of the landed aristocracy that was to come. They would fight back, and while they could be beaten, its another unnecessary distraction for the armed forces of the West.
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