Redrilling Brake drums for 4.5" bolt pattern

Can this be done at home ?

I'll probably be sending my axles out this week to Moser to have them drilled for 4.5" bolt pattern and new studs put in.

But my question is about the drums. Moser can redrill them for $60, which is fine, but add $66 shipping to get them there and back, and thats $126 just to have the bolt pattern redrilled.
Can I redrill the drums at home ? Seems by setting the drum on the end of the axle, with the drum being hub centric on the axle that it would be easy enough to mark the drum for the new pattern. Are the drums hardened steel ? Will I be able to drill it myself on a drill press ?

Anyone ?