That's exactly what the "fix formation leader" button on the HQ menu does, for owners of the full game. Do it in the deployment phase. Added in 2013.
Game guide -> CD estended features, scroll down to "Formation Menu new for 2013"
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In the deployment only, a new button is added to the Formation Menu to allow the fixing of the formation leader. If the platoon leader has been moved to a unit other than the 0 index, he will be exchanged back into place with that other leader. This is chiefly useful for repairing platoons in long campaigns. It is a manual and not an automatic function since some people will probably like the current leader assignment.
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