I am delighted that such care has been taken with JEZEBEL. When I purchased the Box Set "Bette Davis Vol 2" in 2006, I vaguely recall that Warners claimed that JEZEBEL was a new digital restoration from the original camera negative. From what you say, this cannot have been possible. In any case...
Good to read this review - I have the disc on pre-order here in the UK so assume it will not arrive until 2019.
The release is timely: I recently decided to watch my 2005 DVD again, but played the dsc in my Blu-ray player. What a shocking disappointment. The fllm played like a patchwork...