I cant see any other way than to get used to using a 300 - 400 mL jug! Practice, practice, practice!
For 2 drinks, the 600 mL pitcher is the one you want to use. And as with all jugs, fill to just below or at the beginning of the spout.
Steaming these sized pitchers on a Synesso or Marzocco happens in 5 seconds flat and are used solely by most baristas for single drink orders.