Print or Email per Group/SSID for Guest-Wifi voucher

Hello everybody, maybe someone had the same problem. A customer operates several wifis for guests in a VDOM. Each group of guests must be separate from each other, hence the different SSIDs. The respective guests are divided into groups. However, each group should receive a different print or email content. I saw that there are replacement message groups (conf sys replacemsg-group) and in the definitions "auth-guest-print-page" and "auth-guest-email-page". However, I find no way to bind them to the group or possibly SSID. Does anyone know how that could work, if at all? Any advice or help is welcome.

Best regards

Mr. J