From 2005-2006 points of emphasis:
"D. Coaching box: The committee wants coaches to stay in the coaching box. There is a constant problem when coaches wander...
Once the coaching box has been removed because of a technical foul, all related rules restrictions must apply. There's no way to get the box back after the privilege has been lost."
http://www.nfhs.org/web/2005/05/2005..._emphasis.aspx
To me that says once the privilege has been removed, it can't come back.
Sort of a side question. If the HC is ejected does this mean that any T's that would have been indirectly applied to the HC do not get applied to the AC? I would say they can't because the AC doesn't magically become the HC, he's still the AC.
Yes or no?