DNS spoofing via ssl (https) by mitm with own wlan server

Problem: I have a local machine (IoT, lets call it MCC) which connects via SSL to a website (mcc.com) to get some JSON data. I would like to send modified JSON from my own server.

Idea: Setup a local device (lets call is rasp) which opens a wifi hotspot. The MCC should then connect to the rasp. The rasp answers with a certificate from the public server mcc.com, but sends the modified JSON data.

I am not familiar with DNS, but I expect this to be difficult as we do not own the public key of mcc.com. Does someone know some solution here? The MCC does not use some kind of DNS over https.