A BW without the whole horrible jackshaft arrangement is just a FatCat. The awesome thing about the BW is that big, fat and wide rear tire. The FatCat just can't fit a really wide tire on it's swingarm because it doesn't have the jackshaft arrangement. It is both a blessing and a curse.
The best solution that I have seen is Shercoman's TT500 build where the jackshaft is mounted eccentrically as opposed to our eccentrically mounted swingarm. That still causes me daydreams about KTMs with fat tires.....mmmmmmmm.