To start with the red/yellow team are in possession. If the ball is transferred from 1 wall player to the other that is a point but it must go via a red/yellow player.
Meaning they must check off/lose their marker to get a touch of the ball. From there they are looking to turn and play forward or bounce it back for the wall player to play forward, If the other team get a touch of the ball then they become the team in possession.
Possible rotation: rotate between the 3 groups of 2 to take turns as wall players giving a good ratio of hard work in the middle x2 to softer work as wall player x1
Allow the players in the middle to flow between the two central zones once they have been working hard enought o lose their man. Now you can start to coach central midfield rotations to get on the ball