Dregs are a great method to get a different funk complexity going besides what one can get from either WY or WLP. Your best bet would be to order some WY Roselare which is now year round release and add the dregs to secondary to make the beer more complex. In that case one bottle would work, but more is better. The Cantillon is more of a lambic base dreg than the profile for a flanders red. But IME, the added complexity from the dregs would help to make your beer even better. You could always make a small starter from the dregs to pitch as well.
Go tell Steve to order some Wyeast for you! LOL!
