Patrick, I absolutely agree with you. I suspect the Glider Pilot badge illustrated in the MSWPG book may have been a wartime private purchase through a jeweler who riveted the glider shield to a period A&C Pilot wing. I have an American made Pilot wing with the identical glider shield applied with a single rivet. So, the glider shield alteration may have occurred in Australia or America? Regardless of where, or who altered the badge, as long as it's a period piece, I believe it's very collectible.
I wonder if the person producing these reproductions saw the illustration in the MSWPG book and decided to add rivets to all of his fake Glider, Liaison and Service Pilot wings? Just wide speculation on my part...
It is my understanding that the MSWPG book was published in 1997, almost 18 years ago. I believe that the reproduction A&C wings only started showing up around 2008-2009. Even pushing it back to 2007, there is still a goodly and significant time period (>10 years) between when the book was published and the fake conterfit wings (including the rivited alphabet wings) started hitting the market.
Of course, the wing in the book could represent a fake made sometime post 1945 using a good A&C pilot wing and a fake "G" shield. Or it is equally as possible that the wing in the book represents a vintage war time piece. I think there is no way to know for sure, (especially if you can't handle it in person) but I think there are some facts that can be gleaned. First (as raised in a few posts above) it is more than likely that at least the glider wing was made by A&C and that these wings were present years before the fakes started showing up en masse. Second, it seems that at least some vintage A&C wing ratings were 2-piecers that had the rating soldered on a base wing. The question is whether or not a riviting process was also used, and if some vintage A&C wings had the ratings put on them in that matter? Riviting of the rating to a base wing isn't that uncommon in WWII vintage wings, as LGB and a number of the English-made wings (ie Fermin) used that process. If I had to guess, I would think that if these wings were in fact made, they would have been made in very small batches (perhaps by a single individual) and so there may have been some variations, including straight soldering as well as riviting.