We do not have a QR login function that I'm aware of, but if you open a feature request with us for this functionality we can get it on the roadmap.
In the mean time, I'd suggest using one network policy for your entire campus if possible, that way users won't have to connect to different SSIDs throughout their day, they can simply roam between APs on the same SSID.
If that's not possible, at least trying to use the same kind of SSID (PSK, PPSK, Radius, etc) across your campus so users don't have to switch between authentication methods between classes and once they've signed in for the first time, their device should remember the SSID and take it from there.
