Dear Maldon,
I try your EFI file for some time, with some luck.
Benchmark are very good, but system is not responsive, rainbow circle every 30 sec, system hang for seconds, minutes,..
some time no data disk, no sleep, no wake, 3-4 minutes to start. ( have do USB mapping with UsbToolbox, Usbmap, Hackintool)
i tryed some other configuration (acpi, kext...) from other site, with other issue.
The system is not usable in daily use.
From September, I have rebooted at least 20 time per day for experiment. Sonoma first, now Ventura.
I send you my last runme and sys report from OC.
Send me iMac-Pro.fritz.box.zip
SysReport.zip