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Actually, the combination of both methods has already been done. In Glacier I did combine "interpolating PIF" and "translating PIF" once upon a time. The result was, it was seeming to be a little faster (barely faster really, because translating PIF is fast because each iteration takes so little computation, and the extra computation of interpolating really hurts that). I discarded the combination in the end though, because the code complexity was not worth the slight performance difference.

Just to note, I think "interpolating PIF" is a terribly confusing name, since "interpolation" and "PIF" in the same conversation has normally referred to missed scan handling.