Well... Almost....
I did find a legacy ..\FSX\FSDT\JFK folder containing some legacy AES AFCADs - yes, AES JFK was disabled when first installed the V2 version. So, I deleted that folder and reinstalled the latest GSX download. Now, I have three menu options, LOL... 1) GSX, 2) KJFKv1, and 3) KJFKv2.
[Moments later] I decided to search my entire FSX folder for any file/folder containing "jfk"; I found another 'JFK' legacy folder in ..\FSX\FSDT\Couatl\ which contains single file "_init_.pye". I deleted this remaining JFK folder and file and indeed, I now have expected menus 1) GSX, and 2) KJFK V2.
Summary - For thread posterity sake, the resolution was to delete two folders \FSDT\JFK and \FSDT\Couatl\JFK and reinstall the lastest GSX download.
Thanks as always, Umberto.