Great post.
FWIW, there have been some other discussions of whistles at GC, and honeychile and others have posted the "Fraternity Whistles" page a number of times. One of the more extended discussions is in
this thread. In that thread, we noted that the ΑΔΦ is actually ΑΔΠ during the brief period (1905-1913) between being the Adelphian Society and ΑΔΠ, and we deduced that the page is from the University of Texas.