Thanks again for sharing! Yes this will be my approach as well. Just the necessities, nothing else.When you compile OC, it generates the folder structure with Kexts on Kext folder and everything else.
The goal here is to run OC without any Kexts because these types of computers (2013/2014 MBP/A) don't need any special kext to run Monterey natively.
I think that with the death of Kepler GPUs in Monterey, one can still benefit from this thread by injecting ONLY the appropriate kext in the kext folder (root patch) + modify the config.plist file appropriately and get rid of all the other Kexts generated by OC
Does yours have the dedicated gpu as well?