Yeah, most of that is too specific as far as functionality goes. However, you can override tdecimate's decisions using an overrides file and can specify a decimation pattern to be used over a specific range of frames, but it works off frame numbers only, so you wouldn't be able to set it up too look for a specific match such as U- to drop. You would have to identify the pattern and any pattern changes within the file.
For copying the next or previous frame instead of using the current that will never be a feature of tfm because trying to have it work automatically would create about 5000x more problems then it would fix. You could however use stickboy's remap frames filter, or something similar, after tfm and before tdecimate and specify the copying/replacing manually.
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Now, if I could just force the decimate to fall on the (U-) and ensure that the top field is fed to the first blend, and the bottom to the next blend, AND maintain this across different overrides for different scenes, then this should work.
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I don't understand what you mean by "ensure that the top field is fed to the first blend" ?
Anyways, in the end tfm is, as you pointed out before, not really intended to handle this type of specific case, same for tdeint... unless you want to do the entire thing with manual overrides
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