Keep them informed from the very beginning, and report at least annually to the congregation with a written report. Often youth, women's and men's group's reports are included in an annual report book. But do not expect the pastor to spearhead and carry the group. It is not his group, it is the men's group. Some people so value the freedom of local action that they forget the values of belonging to the larger church.
Men have valuable ideas and insights to share.
Men have blind spots that the insights of others can correct. Men all like to belong to a larger cause. A person with a heart for ministry with men. Teamwork is built by meals together, fun times, work times, traveling together, learning together and responding to each other's needs. Learning times can be enhanced through short video clips, discussion, charts, challenges to learn new concepts, humor, and written responses.