You could turn the gates into sites. It's not 100% accurate to what they were, but A) they would be neutral and therefore playable in T2; B) you would have a couple more ways to grab them from discard; and C) since there are 9 good brigades you could have one in each brigade and a multicolor (or 8 and 2 MC, because clay). It's a bit more disruptible, since there's more site than fort destruction and your opponent can steal them in a couple ways, but it's a thought.