I think a better solution might be to simply change the length of time for Territory Battles and the mechanics for progression from phase to phase.
My solution: Change it from 6 days to 4 days and allow Guild Officers to push the guild from its current phase to the next. The first 2 phases on LSTB are really just a warm up for guilds of every size, so this would allow you to 3* and move on, or for smaller guilds, to max out contributions and simply move into the next phase. If you finish the first 2 phases in a couple of hours, this still provides 3 days to complete the additional 4 phases.
The benefits, let the guild go at its own pace and provide more down time before events.