the switching positions is really interesting for 2 things:
1. Getting rid of the SS, SF and this stuff
2. Mass fouling

The AV-Roll I would change to:
An AV-Roll without any modifiers is made (so no Claw, MB) but you could use PO.
The player should be able not only to use it on Push/Pow, but also on Dodge/pow (is it called like that.. ?) and if he has Tackle as usual.
All together:
Body Slam (S):
The player is a natural born entertainer, who does everything to be in the center of attention. If the player throws a block or blitz at an opposing player, that results in a Push/Knockdown result (these 2 results

If the "Slam!!!" is the result of a blitz action, the action ends immediately.
In addition, if the fans throw a rock at a player, that has the "Body Slam" skill, roll a D6. Only on a 1-3 the player is hit normally, on a roll of 4-6 another random player from the team is choosen instead.
Greetz,
gan
Ps: I try not to overpower the skills, but make them be cool stuff
