Well, I thought I give it a try and to my amazement, I was able to install Ventura successfully and gotten graphics acceleration too.
Here are the steps I took:
With the OC 0.8.6 bootpack, I added this to bootarg
-no_compat_check
Switch SMBIOS to MacBookPro14,1 ( not sure if this is require but that's what I did)
Upgrade Big Sur using Ventura USB installer successfully but without graphics acceleration
Download OCLP 0.5.2
Selected "Post Install Root Patch" -> Start Root Patches
Rebooted system - > full graphics acceleration
Switch SMBios back to MacBookPro11,4 and it still works
Note: to run OCLP, SIP must be disabled. Just change csr-active-config to 03080000
Add this to bootarg as well amfi_get_out_of_my_way=0x1
Tested function so far:
Audio works / Audio buttons works
HDMI / DP video /Audio works(4K will need patching)
3 displays - Main / miniDP / HDMI
Fn+ Arrow for Brightness works
Touchpad with some gestures
Sleep / Wake works
Wireless works - using Broadcom DW1550
SD Card Reader - works