Why not just use the managed switches for the trunk with multiple vlans?
then POP managed switch can be used to connect the wireless radios to its vlan and the wired clents to the wired vlans... (you could use 1 or 2 authservers as well if you use 1 you could put it on the core switch in a DMZ type network, and if you use 2 you could hang them off router a and router b respectively..)
