Interesting. Good food for thought.
The round knobs are the exception rather than the rule (I have about 40 levers and just 3 knobs, and all the knobbed doors have a lever on the interior side), and they are all the same crappy, shiny brass finish. Doesn't sound like they had to do it that way... My neighbor owns a house building company, so maybe I'll ask him what his folks do.
I hadn't considered the double-keyed dead bolt option. The front door has a full length glass panel next to it, so maybe this is a good idea. We have two other exterior doors with a regular hand-switched dead bolt if we needed to run out of our burning house.
1976 FJ40 - green and mostly stock
1996 FZJ80 - not so stock