Years of research; yes.
Since we don't have any pictures of the ESB helmet interior during filming we can't say for sure what sort of foam they has rigged up if any. They did indeed have the chin cup with straps installed and the " bonnet" waa worn.
For ROTJ the same is true but since there is a excellent argument they would have rigged it with the suspension at that time, I would rig it as shown in the picture intwenothor has linked.