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My goldens are actually tame enough I can usually just grab them. I usually net the ringneck pheasants. I have used a recovery cage like you're talking about for quail - you put one bird in the cage and it calls to the others and lures them in. Not sure how well it would work with goldens. I have also set a large cage in the pen and sprinkled scratch grain inside then closed the door once they went after the scratch.
This PDF article by John Corder may give you some pointers:
http://www.gbwf.org/pheasants/catchapheasant.pdf
Dan