MITM with my own accesspoint & kali

I own an accesspoint with 2,4 ghz and 5.0 ghz. The accesspoint acts also as a router. I'd like to deactivate the 2.4 ghz on the accesspoint and then use kali as MITM for the incomming 2,4 ghz data.
Switching off the 2,4 ghz is no problem, because it's mine and I just have to deactivate it :D Kali is installed on a raspberry pi. The pi contains a NIC and a wlan-stick.
My goal is, that every former connected device would automatically connect to the kali-server which is acting as a MITM device. The wirless-lan should still be password protected (with the same password).

IMHO I'd say that I've to do the following steps:

1. Write down MAC/IP of my accespoint
2. Deactivate 2,4 ghz
3. Copy the MAC/IP/SSID data and add it to the kali-wlan-device
4. The kali wlan has to have the same password
5. Forward every incoming data from kali to the wlan-device

Questions:

• How can I add the MAC/IP/SSID to the wlan-stick on my kali?
• 2,4 ghz on kali and 5 ghz on the accespoint at the samte time should be no problem, right?
• Thanks a lot for help/input!