If memory serves, it's the B5D that one shouldn't use with the MKxV series mics since the plastic cage/basket interferes with the pattern. But the plain foam B5, without the basket - and any other foam windscreen like the Shure A81WS and DPa UA0896 - should work just fine.
FWIW, when I ran Schoeps MKx, I always liked the B5 or DPA UA0896 for indoor and the Shure A81WS for outdoor.
Cue Mr. Willet to chime in on the Rycote options...