It is possible to change the material in a specific keyframe_delta?

Development Programming & Scripting Verse
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1

Example:

MovementKeyFrame1 : keyframe_delta = keyframe_delta #Key Frame 1 to begining
        {
            DeltaLocation := VectorToMidPoint
            DeltaRotation := StandarRotation
            DeltaScale := StandarScale
            Time := Frame1Time
            Interpolation := EaseOut
            Prop.SetMaterial(Mat_BakedB_0,?Index:=0)
        }

It is possible? Any workaround?