John, as you know, RPT jets in Oz cannot operate without slope guidance of some sort for more than 7 days, so unless the threshhold is only very-temporarily displaced, you'll have a PAPI at least.
DME profiles or Vertical Revisions are OK further out, but I find that, when the action starts, ie less than 300ft, they're too inaccurate. Fly the same picture you always do ie with your eyeballs. There's no valid FOQA data (no ILS to ping you on) so there's no big deal being 1/2° steep or shallow, if you get it a bit wrong, as long as you don't bust the sinkrate rules.
It's entertaining watching the i generation trying to set up the FMS to show the right thing.
I will admit that it is "different" landing over a very long displaced threshold, even with a PAPI. "Where'd those big white squares go, Bloggs?!".