Airplay receiver problems on Late 2015 '27 iMac potentially due to KDK?

I'm running Sequoia using OCLP and I spoofed the device id to be 19,1 instead of 17,1. I'm running version 24G90 but the only KDK's I can find for sequoia go up to 24G84. I know I need to get the right KDK for this to work but I can't figure out how.

I ran the post install root updates with the 24G84 KDK installed however whenever I try to connect I just get an issue that states "Cannot connect to iMac".

My main priority is to be able to use the iMac as a display for a newer MacBook in full 5k.