The only changes that should be made is if you block and extra point, you should be able to return it for that same point. If you pick off a pass on a two point conversion or recover a fumble, you should be able to return it for the same two.
How about if you go out of bounds, the ball gets turned over to the other team? H’mmm, perhaps they could have a designated hitter instead of a kicker. For the extra point a guy is given a baseball bat and has to hit the ball into the end zone?
My bottom line. Football scoring isn’t broken, thus no need to “fix it.” Of course the criminals will always try to bribe someone in order to fix the game.