If you do this, you're stuck buying the SBP 10x1.75" drums and re-drilling them every time they have to be replaced.
While the SBP drums are currently available, they've gone out of production several times in the past. You're much better off just using BBP axles with standard BBP axle flange offset. The BBP, 10x2.5" brakes are usually pretty easy to find used. You can even use 11x2.5" brakes if you want some more stopping power back there.
