Genuine Proposal:
What about whist ability is active the units cloak while in cover and can move at 1.2 movement speed.
This way it adheres to the voice line, but offers an interesting but counterable playstyle, I'd have a tooltip pop up for enemy too so they knew that there was infantry moving along cover points at 1.2x speed to flank you.
Would certainly be more interesting than removing unit icons from the map.
![Honor icon](/images/replay/honor_icon.png)