I thought so, too. But I fear there will be no way to produce something "in between" two frames. You could simply produce pseudo-interlaced frames by taking a clip and the same shifted one frame, maybe like this:
source=xxsource("file")
shift=trim(source,1,0)
i=interleave(source,shift)
i=weave(i)
But if you deinterlace this, the interpolation will always be optimized to the one field you specify. If temporal methods are used like with QTGMC, then full motion-compensation is used to produce a second clip for interpolation, but still for the exact same point in time. If no temporal methods are used, interpolation is fully spatial, so the second field won't be used at all. The idea, though, is interesting somehow.
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