Malicious Contact on a Home Run

 
With no outs and the bases loaded, the batter hits a home run. All admire the home run, including the catcher, who is standing on home plate. The game has been "tense" between players, fans, and coaches, so the runner from third uses the home run as an opportunity to step on home plate and then maliciously crash into the catcher.
 
The defensive coach wants the runner called out, the runner and coach ejected, and no runs to score. The offensive coach reminds the umpire that the catcher was in the base path without the ball, so medical attention on the catcher should continue... while recording 4 runs in the scorebook and no penalties.
 
What actions should the home plate umpire take?
 
Call
There are two parts to this play. This first part is straightforward, while I accidentally made the second half somewhat complicated. When there is malicious contact on the part of the offense, the player is declared out and ejected -- unless the player has already scored -- in which case the run counts and the player is ejected. In the situation below, R3 scored and then maliciously crashed into the catcher -- so R3's run counts and he is ejected (NF 3-3-1m PENALTY).

The complicating factor in the play below is that there is the rare circumstance that there is malicious contact while the ball is dead and an award is in progress (an over-the-fence home run is a dead ball and a four-base award to the batter). In NF, when there is malicious contact during a dead-ball award, all the runners are allowed to score (NF Casebook 9.1.1M).