Hosed my boot drive AND my CCC Backup. Now what?

I've been running Big Sur since August and last night decided to upgrade to Monterey. I backed up to an external SSD using Carbon Copy Cloner beforehand. The upgrade went well, but my bluetooth dongle wasn't working. I did some searching and found a kext that is supposed to enable that. I dropped that into the kexts folder in my EFI and rebooted, forgetting that I also should have updated my config.plist. The machine took a while to boot, but eventually did, and I was able to turn on...

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Author: EddyMac