If we are looking from "realistic" perspective, I think adding Kai Tak won't be realistic as currently, the site has become a development site for the currently completed Cruise Ship, Some Future Flats and also a future site of a huge Stadium
But one of the IFAEs (@Moritz_Babl ) has edited VHXX for us. Which would be an interesting addition to this simulator after Global comes out.
I'm not sure if it's going to be added. But because it has been edited, I think it has a big chance of getting added ❤