Being able to site examples of colleagues will really help. Lisa, IMHO your original idea, getting them to write, is a good rationale.
Writing is a skill to be mastered.
Daily practice in the skill strengthens and deepens it. Encourages it to become a habit. I use several analogies, but here is my favorite one. There was this football coach who wanted his team to be the very best. He decided the way to get them to be the best was to really teach them football.