If instructors in your country don't have control over the curriculum, then you'll want to first approach deans at a few institutions teaching in the subject matters you want to improve on Wikipedia. Once you get a few deans on board, get them to recruit a few volunteers in their department to join your pilot.
If instructors control their individual curriculum, you'll be able to recruit instructors yourself. For a pilot, it's a good idea to stick to one small geographic area — one city or even one university campus. That will enable you to meet with instructors in-person and be more responsive to any concerns they may have.