You usually can have multiple SSIDs over both wireless bands, i.e 2,4 and 5GHz
It is up to you how will you split them to divert traffic towards a VPN instead of the ISP.
But how do you set up the routes of the VPN so that only one access point goes over the VPN and the other can simultaneously broadcast over clearnet?
I have hearf of many people having issues where only one access point would have a connection. And LAN going through the VPN at the same time seems almost impossible,