Not recommended, but if you must - leave a bit more beer behind in the primary (maybe up to an inch or so above the trub). This can be discarded (quaffed?) when your ready to wash. And, re-add the airlock, etc.
I would also make sure to use a starter with any of this yeast on future batches just to make sure it remains viable.
Atomic Dog Brewery
On Deck: Centennial IPA, Dry Irish Stout
P: Cascade Pale Ale
T: Carbed Crystal Light, Root Beer, Vanilla Cream Soda, Tripel IPA, Apfelwein
e^(pi*i) + 1 = 0