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Unfortunately, the modern 911 doesn't take well to the older style auto club badges. There is no 'grill' to which to affix it. I tried something like that a bit ago but was not pleased with the results. Some have suggested that you could construct something that would support the badge(s) alongside the rear license plate. (If done in front small rock chips will eventually do a lot of damage to them).
Our PCA division sells both national and division badges. They sent me a link to source for license plate badge brackets, though at the moment I can't find it. Pretty inexpensive, as I recall.
If we pulled off the bumperettes to get the Euro-Plate space back, and had a custom plate mount made to fill the whole space, there would be lots of room for such badges.