What I did was to put a screw in the part you're going to glue to the helmet. Then I scuffed up the area around the opening with sandpaper. And then I cut small squares of fiberglass and cut a small slit in it. The slit slips Over the screw hole. Then I put a layer of resin down and position my screws on the surface. Then I gently put the fiberglass square over the screw and covering the base of the female portion. Leaving no resin on the screw. Then apply additional resin on top of the fiberglass use as many layers as you want. I did this step before drilling the holes in the glass. Has worked like a charm so far. Make sure you give it a solid 24-48 hours to cure before you try to suck the lens to it. A little love with a heat gun can make the process of sucking the lens down with the screws a lot easier.
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