Booshman said:
I made that dual layer version, which I sourced from the original PAL release. So the intelacing problem is present on that version too. My suspicion would be that it was also present on the original 2 disc NTSC version too. I hope there is a way to undo it but we may be stuck with it.

I didn’t know that there was a 2-disc NTSC original – I thought that the PAL original was later converted to NTSC. Could some of the footage that you need be taken from the ABC cut?