With the gear and expertise we have, it should be possible to integrate the LD footage back in and colour grade it to fit without a really noticable change. The obvious way to do this is to insert footage at cut points, so that although you may end up inserting a little more footage than is required, it comes in and out at a cut point so is not as noticable.
I am hoping that the audio mix on the SE will be a lot better, in which case I will be keeping it and only adding/removing audio as required.
I am also doing an 'archival' version of the LD's, which will be pretty much just a straight copy with a mild colour grade at the highest possible quality, (with the missing lei footage) with no extras, no additional audio tracks etc. Just the movies at the highest bitrate possible. Am Also toying with doing a WMV9 version for PC playback, as the quality would be better, and there are some WMV9 players coming onto the home player market as well.