I don't even know if this would be doable anymore mainly because the tying community has splintered so much and is scattered all over the internet in more regional forums.
I wonder if you actually had tyers send in a resume of sorts of swaps they have been in and completed, so you could contact the Swap Meister and see how they did whether that would cut down on the late or absent tyers. Regardless you would still have quite a few that would drop for some reason.