Setup. Keeper in front of goal. One server wide left and one wide right, 12 metres away. A presser starts 10 metres out in the middle.
How it runs. Server one passes in. Keeper opens up, takes the first touch across the body with the back foot and passes to server two with the other foot. Ball comes back and goes the other way. The presser jogs in to hurry the touch. 60 seconds, then everyone moves on one position.
Make it harder. Presser goes at half pace for real. Keeper may go back to the same side if the switch is shut. One touch when it is on.
With 4 keepers. Keeper, two servers and the presser. Nobody waits.