OCLP is a project develop from OpenCore. It help the user to config and install OpenCore on genuine Mac in an easier way, also help old Mac users to patch some system kext to run newer macOS. But it use the same official OpenCore release.
For cMP, IMO, the best way to run Monterey is to upgrade the hardware (e.g. your RX580 is the supported hardware), then use OpenCore to install an unpatched Monterey.
If you are ok to do that, my link at post #13 has the pre-configured OpenCore for cMP. Which allow your RX580 to display boot screen.
Then you can follow the video guide in that link to mod the config plist, and install Monterey natively.
After that, you can revert the config plist to enable full GPU HWAccel, and CPU power management, etc.
The steps are more complicated than using OCLP. But I insist to push the user to learn some basic stuff, such as mount the EFI partition, locate the OpenCore files, and basic skill to mod the config.
If you are OK for that, you may try my package.