so the only hope we have now is copying the DVDs in September and editting the new scenes with the old ones..."
And you'll quickly find out how pointless it is to "seamlessly" combine admittedly inferior LD footage with the DVD footage (which will most likely have to be recompressed)
Not to mention the fact that you will be combining anamorphic and non-anamorphic video...
"I think that as long as the transitions aren't so jarring"
Unfortunateely, most of the transitions are wipes or dissolves. Good luck syncing those up.