Noel - I am not an expert with experience, just reporting what I have read.
I think that the 'dried out hanging caprifigs' are not what you want.
There are 3 crops of caprifigs, the one that hangs on over the winter is the mamme crop, and the wasps overwinter in it, and that crop does not have the pollen.
The next crop is the profichi crop, which forms in the spring and matures around June in CA, I think. This is the caprifig that has pollen, and the one you would collect and hang in your fig orchard at the right time. Someone else will need to help you with timing :)
The next crop of caprifigs is the mammoni which I think matures in late summer/early fall.
In each crop of the caprifig, the wasps mature from egg to larvae to adult, and leave to find the next crop all at about the same time. The fig wasps are not looking to pollinate figs, they are looking for female flowers that they can lay their eggs in - which they do in each crop of the caprifig. The caprifigs have female flowers as well as male ones(at least there are male ones in the profichi crop). Because of the longer length of the style of the common(female) fig, the wasps are unable to lay eggs in that type of female flower.
There are some on line sources for info, I like this one: http://waynesword.palomar.edu/arbimg10.htm It does get off track with discussions of other species of figs, but I think I understand the subject after reading thru it