Well let's face it, it ain't ever gonna look that good. Heh heh. Oh well, assuming it's relatively smooth in that section of the windshield(s): Think what I'd do is trim a flat sheet to fit the opening, bevel the edges to match the deck & radius in the existing w/s. Once ya get it fit right set it in place & glue a couple 2" ears on the backside so they're flush with the inboard, vertical wings on your shield. After the goo dries drill a couple 1/4" holes through your w/s and the tabs, add a couple quick pins & yer good to go.
This is the best I can do on short notice ...