I agree with your comments about simulators being very limited for any offshore training by day or by night, but again, if enough $$$$ were thrown at that problem, in the 21st century it shouldn't be insoluble. Aero has a very good little simulator in PH now (albeit with no movement) but the visuals for rig approaches are far superior to most of the expensive level D full-motion simulators on the market, so it should be possible to upgrade a level D.
What kind of sim does Aero have in PH? Who built it? And how can it be better than a Level D? I don't follow the logic of how a higher level of certification yields an inferior product.