As long as you have enough length to push it on, you can use a BAS over a small foam. I've done that with even smaller mics. The small foam fills the gap so the BAS stays on snugly enough.
Few more tips-
Make sure the screens are covering both the front and side vents equally, with about the same amount of foam/fur over each.
I saturate mine with silicone water repellent once or twice a year (let them dry out thoroughly before using them), which doesn't substitute for an umbrella, but provides some degree of water repellency, keeps them cleaner, and also prevents them from becoming saturated if they get splashed, fall in a puddle or whatever.