I'm a big fan of "simplest is best", and would probably pitch the two packs of US-05 if I were in your shoes (although if I only had one pack, I'd pitch that and not worry about it). Save the liquid yeast until you have a bigger flask.
Here's what I did: I splurged on a $10 jug of glug wine at the grocery store, used it for cooking (and drinking), and ended up with a perfect jug for 3 liter starters. 9 ounces of DME and 3 quarts water gives a gravity of 1.033 which is just about right for a starter. I usually decant before pitching, so the DME should be extra i.e. not part of the recipe.