So far as I'm aware, the area prior to a displaced THR need not be maintained to the same structural integrity as the area beyond the displaced THR. In this country, the area prior to the displaced THR can be used to line up for take-off, but definitely not for landing.
In any event, you may not be aware of the location of the obstacle that has created the need to displace the THR. Thus it would seem to be most unwise to try to land prior to the THR, as this may entail the use of a different approach path that might conflict with the controlling obstacle. Better to refer to the displaced THR and, therefore, be sure that you and your pax will be safe.