The secret is therefore to get the buy-in from the unions. Not unless they believe CRM is in their member's interests will you make any worthwhile progress. Force the recalcitrant into a room and they will stare at the ceiling for few hours and ask no questions other than "Can we go home now?"
Once the buy-in has been obtained, use the unions to help design the first courses. Pay them if you have to. Use well respected senior drivers to deliver the courses and build up from there. CRM will take time to to earn its way onto the footplate.
Only once you have the basic concept underway can marking and evaluation get clever. Until then, stick with coloured lights - green, double amber, Amber and red.
Pm