Yipes! That's some serious fermentin' goin' on there! I applaud you, sir.
Is it feasible for you to acquire larger quantities of yeast from suppliers, like brewpubs probably do?
But, like EvilGnome said, I guess you could just brew a batch of beer and then pitch the cake.
On Deck: Jamil's Vanilla Robust Porter
Fermenting: Orange Blossom Mead
Kegs: Element 56 Pale Ale, Ron's Belgian Blonde, Summer'n Saison, Furloughktoberfest '09, Grateful Pale Ale, Sam Adams Cream Stout Clone, EdWort's Apfelwein