A few thoughts here. If you place a large free-wheeling block outboard on your aft cross beam, lead the line through it then to a ratematic cheek block on your front crossbeam, the angle from the crew to the cheek block should allow the teeth of the block to nicely grab the sheet while keeping it out of the way of the driver.

Second. Why would you put stopper knots on a chute sheet? That's an accident waiting to happen it would seem.

Third. The block on the clew of the sail will reduce the loads, but as mentioned elsewhere provide issues with snuffers and produce additional lengths of sheet to be delt with. Also, it would not take up as much load as the above mentioned approach.