do you know of someone who has done this or something similar?
I can't say that I have. The WFBS are high on my list of breeds that I'm interested in preserving. From what I understand the white face doesn't come through on the F1 offspring but does on some F2's and on F1's crossed back onto a WFBS. While I haven't read anything on the exact workings on the white face it does seem to behave like a recessive and is undoubtedly a polygenetic trait.