Jim I think the RIO hard mono would work but 30# is too heavy. You want 15-20#
Last year I started just tying a length of hard mono down the length of the hook out past the eye. Tie it in on the side with the hook point. Then finish the fly as usual. When you are done just bend the mono extending past the eye back towards the hook point. Trim it a little bit past the point and you are in business. Seemed to work pretty well.
I would say more than 50% of my bone/permit flies have weedguards.