Te format I've used is to require one list, that you choose a fleet from before the game starts, with knowledge of the race your oponnent is playing.
it works well, with a 3-round format...1 skirmish, 1 raid, and one battle. Into the Fire looks like it was 4 rounds though, so may not fit as neatly. Very time-limited games, our Battle PL games took over 2 hours, but the skirmish were usually done very quickly. some as quick as 1 hour.
Try: 5 skirmish, 5 Raid, 3 Battle, 3 War.
Chernobyl