Steve, you know its hard to beat the mechanical security of screws and locking (NOT Nylok!) nuts. Countersink flathead screws with Devcon or JB-Weld filling the screw holes, then filed off makes for a simple, almost invisible fix- especially if you finish the job with a spritz of appropriate color rattle-can paint. One screw per emblem should do it. 250 degree F running oil temp and differential heat expansion (glue vs aluminum or steel) will likely keep any glue from guaranteeing a permanent hold. And Goose plaques are expensive!
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