Whenever we get a change to instructions, or new instructions, no matter how minor, we have to sign it off as read and understood. It's a CASA requirement.
All ATC's will have to sign off 2b one way or another.
A big change like 2b should ensure all pilots that use the system acknowledge the education package and sign it off as understood. If CASA are serious about it's implementation, this should be a minimum requirement.
We do it, it's not too much to expect the other side to do it as well, especially those who are supposed to benefit by it.
CG