Ouch! I was wondering if I'd run into that...
So, it looks like the best way (and cheapest) will be to just have the drums filled/redrilled.
Since this posting earlier, I've totally stipped the rearend down to the tube. No noticable wearage of cracking on any of the gears. That being the case, I'll stick with the axles I have now.
If anyone else has any thoughts, I'm all ears.