Thanks to the power of Google and friends who care, my Google Account lock-out is now resolved. Thanks to Varun, who found an amazingly helpful thread on XDA. “Simply” remove Android Login Service from your Google Account Security settings. I had 9 in there and clearing them all followed by a restart on my phone has me back in business!
Be careful out there … and if you know Varun personally buy that man a beer if you see him before I do!