No more ambush, new rule forces teams to let the other team know they are doing an onside kick

<<teams kicking off from the opponent's 40-yard line>>

Surely that is misworded.

That would put the ball being kicked off 40 yards from the receiving team's goal line.
Seems misworded, but with the rest of the proposed rule changes it makes more sense. I think it would just look better if they kicked from the 50, but that aside, these new rules almost force a returnable ball by introducing a "target zone" from the goal line to the 20:

1. If the ball does not cross the 20 in the air, the receiving team gets the ball at the 40.

2. If the ball crosses the goal line in the air, the receiving team gets the ball at the 35.

3. If the ball first hits the ground in the target zone and rolls in the end zone, the receiving team gets the ball at the 20.

Putting players on the same side of the field to start will shorten the distance that players are running and reduce speed at impact as a result.