I've aerated a couple different ways. Recently I just poured from primary to primary, several times. (5 gallons) After 3 or 4 transfers htere was a very nice frothy head on the wort. The last pour I put the yest starter in first.
I also have a very large whisk, probably over 20" long. I will just get it all worked up with the whisk. that is what they were made for, incorprating air into things. Yeah it is a bit of a workout, but I bet we could all use a little bit of a workout anyway. lol