Would it be possible to expand the Weekly key listing per character to show the number of keys done to accommodate for the vault? For example, I've done 6 keys this week, which correspond to a 19 in the first slot of the vault and a 15 in the second. On mouseover you could show 6/8 for vault completion as well.

This seems doable based on what the blizzard apis offer but will take a bit of time to do the implementation, especially between holidays and raid activities. This may not make it til S2 but will be worked on.