Kind of has been done. In SM1 and 2 you had Order Counters [and we have always used them, as we added Activation with SM1 as we were long time gamers] ... 4 Counters :
CHARGE
ADVANCE
FIRST FIRE
FALLBACK
When using the FALLBACK Counter, the entire unit, has to move at least 4cm away from the enemy.
They must move. 4cm up to their Charge rate.
They cannot fire.
And the Unit gets a -1 to enemy fire. As the unit is trying to break contact, firing the smoke GLs on their vehicles, using every fold in the ground as cover, evading fire, etc., while falling back.
No morale test was required ...
So you may be "reinventing the wheel" so to speak ...
Note the GLs on the plastic Rhino
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in the pic ... you'll find those on Land Raiders and other AFVs as well. Just like on real world AFVs.