I believe such basic functions are not a plugin, but in the application core.
Apart from that, discarding and interpolating one field can be achieved easily with AviSynth core functions (SeparateFields, SelectOdd/Even, *Resize).
And it would be one of the worst methods to deinterlace. Why waste quality intentionally (except for academic purposes, to show how bad this result is)?
Recommendable deinterlacers which don't discard a field but use adjacent fields to reconstruct content are, from fast to precious: Yadif(mod), TDeint, QTGMC (that one has a complex installation but will be worth the efforts).
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