OC and kext updates are always available on Github. Milliuco maintains a thread here about the differences in OC versions. As others have experienced you may encounter performances issues with your GPU if you update to macOS 12.3.
Not sure which Intel Graphics you are talking about. This thread is for the Z690 motherboard and the built in Intel graphics do not work, you will need a supported dGPU. However, your hardware profile indicates you are using a Z490 motherboard which the built in Intel graphics work just fine.
I would suggest updating to Opencore 0.7.5 (released tomorrow) first with current configuration for Big Sur. Then after you have a problem free Dell inspiron computer running O.C. 0.7.5 for Big Sur you might want to try to update to Monterey.
@ CaseySJ - I've enjoyed all 695 pages of this forum plus the over 3200 pages of your Z390 thread. Others could answer most of their questions if they would just take some time and learn. Your awesome. Thanks!
Yosemite or El Capitan was the most recent macOS I ran on my P55 rigs...both were stable with the right configurations. I have found if you stick with what your hardware vintage is compatible to macOS version you'll get the best user experience.