Rickochet
I highly doubt that gutta percha balls are returning any time soon so that isn't a logical option.
Banning the driver is an option.
3 wood distance stats compiled by Trackman show on average 3 wood carry distance is 32 yards less than the driver. IMO, This would be an ideal reduction to apply to the field although I believe that a tour ball would be the choice over no tee if it came down to it. No tee would by far be the easiest, simplest and most immediate change