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If installing with existing Windows, make sure the EFI partition is at least 200MB else MacOS will complain.

The reverse works fine too. Just make sure you're on a full GPT partition scheme. On my Toshiba laptop, I installed macOS with OC on a disk with an existing Win10 installation and never lost anything. As long as you follow the recommendation/guidance (cf. Dortania OpenCore guide), you'll be Ok.

Create 2 partitions, Install MacOS, then Windows.

I mean in the Config.plist

try changing SecureBootModel= Disabled

Did you set BIOS to UEFI/AHCI Secure Boot disabled

HP 840 G3 100% working on Monterey. Somehow there is no AppleALC 1.6.2 kext to test. So, the workaround is to include -alcbeta in boot-args Kudos to JakeLo Checkout working EFI