to make a list of candidates he would approve and then ask the participants in the CM campaign to vote for 4 ( or depending on the slots) candidates, the ones that gather the most votes enter the campaign.
The problem with this approach is that he won't be able to balance the appearance of the signature across all the different boards he wishes to target, by observing how DS chooses the campaign candidates you can tell that he usually looks for the best canditiate/s within certain boards and not just the best overall, or else he would simply count on the number of earned merit, but that isn't the case.
This approach is very tiring for any campaign manager, but it ensures the best results for the project.
Also for those who don't get picked, it doesn't always mean the accepted members are better than you overall, they are likely just better fit for that "specificic" task.
Good luck to everyone.