Fred would know better but can you swap the outers to true d-44 outers instead of running the strange/weaker scout d-44/d-30 stuff? I would think you could take an entire waggy axle and swap everything from the knuckles out while keeping the 5x5.5" bolt pattern. You could also run high steer with the chevy flat top knuckles (don't believe you can do that with the scout knuckles).
Your pig is heavier then mine but it has a smaller wheel/tire combo and less go-pedal. I have never seen anyone snap d-44 shafts like you (you must have been wheeling right!).