Asaki said:

Surely some of the more able members here could cook up an un-interlace/re-interlace AVIsynth script to replicate what this guy did?

http://www.modeemi.fi/~leopold/Babylon5/DVD/DVDTransfer.html#030421proof

It's nothing that challenging - the effects are just 30p.

The real problem is that the live action is 24p, while the effects are 30p. This makes it difficult to produce a progressive video stream because the frame rate would need to vary shot to shot.

I think this is possible in an MKV container, but I think you'd end having to put it together on a command line.