From NAC manager you can not configure AP.
From NAC-GW (IAM-GW) you can ssh to the controller and configure the AP there.
I believe you can use Wireless manager (from NetSight console) to configure new AP.
EWC can send to the NAC AccessPoint name and SSID. if your NAC rules are working with AP name and/or SSID then you do not need reconfigure NAC, you do not need reconfigure serial number, you just configure new AP with the same name as the old one.
Regards
Zdeněk Pala