Fixing an interlaced video that's been resized progressively is one of those problems that you'd expect someone to have solved, but they haven't. It gets asked here quite often. Stephen R. Savage's advice is correct.
However, some of the resolutions you listed are larger than the original. In that case, if the resizing was very dumb and the subsequent encoding was high quality, it might just be possible to recover the original fields.
You're going to have to post some samples to know for sure!
Always. Keep. The. Original.
cheers,
David.
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