Moved the hub within 2 inches. After several iterations (exclusion, checking the UZB stick to make sure no ghosts, factory reset, inclusion), I decided to try SmartStart. Pulled the battery for 30 seconds, reinserted, and boom - front door done.
Just my luck, I now see that the Kwikset 914 contemporary matte black Zigbee is back in stock. I could have saved hours of my life. That was my first choice but was unavailable for a while.
I sincerely appreciate you taking a swing at this @rlithgow1 . Off to finish the back door.
Edit: Back door also added in seconds with hub nearby and using SmartStart. Not marking it as a solution, because it is just working around a flaw from Kwikset. Their instructions literally warn you to not power the lock until it is installed on the door ... at which point you cannot pair the device without jumping through hoops.
