No, nothing of the sort, but I finally had success this evening!
Started by reformatting all internal drive containers to ExFAT, clean installed Mojave, then installed OCLP back to my OpenCore drive.
This time I configured OCLP with the 5,1 profile vs. defaulting to the Host Model. The SIP and security settings were much different with the 5,1 profile. Built a Ventura install disk from there, connected an Apple Extended USB KB to my hub, restarted, and… Ventura booted! Installed straight to a spare SSD, and ran with no issues.
Placed Sonoma on my McFiver drive after that, and no issues either, with the exception that my internal Broadcom WiFi/BT card is dead. Need to figure that one out, as I understand there are root patches which were supposed to address this?
Altogether, a huge pain, but happy I figured out the right set of options to FINALLY get things running and set up for testing! Hoping to squeeze a good year or two out of this old 5,1!