LTC Vindman should not only be dismissed from the NSC but also from the US Army. He serves at the pleasure of the President. He attacked the President, his Commander In Chief, disgraced his service, and betrayed his country.
No need to sugarcoat it. Dismiss him for cause. It is not retaliation. It is responsibility.
It will be viewed as retaliation to matter how you slice it.
Give him boring no where assignments until he gets the message and retires.