Instead of yeast washing after primary fermentation in a carboy, how about this?
I usually make a 2l starter in a 4l flask. Then I chill overnight, decant the liquid and pitch the slurry.
What if I make a 3l starter and prior to chilling, pour a quart of the well-mixed (stirplate) starter into a sterilized mason jar and put that in the fridge. The remaining starter is chilled, decanted, and pitched like usual. The mason jar can be pitched (after decanting) into my next 3l starter.
Now I don't have to wash the yeast or collect it from a carboy.