I wouldn't recommend doing so many SSID's. Anything more then 4 SSID per AP and you're going to start seeing significant speed impacts, it also does nothing for security. TBH i would run 1 or 2 SSID's with the AP's set to L2 LAN isolation. That way devices cant talk to each other even if they are connected to the same SSID. As for key management, that can be a fun one. Depending on how your environment is setup, and who owns the devices you may want to consider a captive portal with 802.1X authentication or just use a PSK.
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