It may be easier just to have a "Frontlines Reports" thread every week. Pick a certain planet or strategic point for each week. People can report the results of matches in the thread (colorful commentary included?) and at the end of each week, you or someone just tallies the matches up. Whichever faction gets, say, 70% of the wins conquers that particular battle / planet. Less than 70%, it's the same place.
The main issue with this is that there's really not much incentive to play. I guess there wasn't enough anyways, but maybe it'd be easier for people to just opt in as they can, rather than setting a time?