Baumer,
I beleive the Revi16D sight had an elevation knob to adjust for bombs and rockets. Why not duplicate the horizontal center reticle line down intersecting the verticle reticle line where you expect the rockets to impact at your speed and elevation? In effect you will have two horizontal reticle lines but, since HiTech has not COAD'd the ability for us to adjust elevation on our gunsights, this would be a comprimise with history.
You would have two static horizontal reticle lines but, both would be correct for their function and would still look as historicaly accurate reticle lines for the Revi series. Long narrow lines of light with regularly spaced hashes. Be kind of classy looking in a German sort of way.