A telling difference between forward and side slips: Side slip by definition merely counteracts the crosswind component to allow a straight line of flight, but the useful forward slip is usually a much steeper banking turn counteracted by a much greater rudder deflection.
There is NO question that a forward slip will get you down faster than S-turns for an emergency. If turbulence is not a factor, controlability and loads might be within normal limits, but gust loads or a heavy foot will quite possibly put you far out of the surface loading limits for a big tail. Maybe also for pylon wobble on big wing-mounted fans. If the tail is one of the fiberglass type, the aircraft - in good conscience & with what we know now - may not be reuseable afterward.