You seriously make your starters outside? Wife can't handle the smell for 5 minutes it takes to make a starter? I know the drill though, happy wife happy life.
I haven't gotten around to it, but I've always wanted to make a bulk starter from all grain. Make a couple gallons and then freeze in soda bottles or something like that. I guess the trade-off of time to do that and take up freezer space hasn't met the intersection of just using dry extract.
What about just bumping up a batch's recipe by a gallon or so and using that extra wort for starters? 2 birds 1 stone kinda thing.