I'm afraid that I'm still lost, Greg. I didn't dedicate a lot of time on this because I'm just curious, this is not related to the things I'm studying.
I've got a copy of Wald's book, and I was able to follow his section 2 (not the bit about the Lorentz force, though). Apart from some minus...
I am no mathematician, not even an expert in Gauge Theories, but I came across this article
http://arxiv.org/abs/1409.6716
(published here http://www.sciencedirect.com/science/article/pii/S0393044015002284)
when I was looking for some "condensed-matter-type-monopoles", and the author claims...