Dodged a bullet. It was 50/50 as to whether I would be proven an idiot and it turns out that it's the camera that's an idiot and I'm just uneducated.
I wish one could just put the camera in Av mode and set the aperture to match the lens selected aperture, then press the Green Button and the camera would figure the rest out. A GREEN button which reads your camera set Aperture priority setting you've set when in Av mode. If that's even doable.
Anyhow -- Looks like a TTL basic flash is in my future for those rare instances. For now I guess I should keep an A lenses or DA in the bag for when those situations arise.
Oh. And it looks like I have some reading to do ...
Thanks all!!