The thing to remember (both the folks on this forum, and any Larian folks trying to sort through all of these) is that the reason that 5E pared back the weapons so drastically is for ease of use. Just because the PHB doesn't have a bastard sword and broadsword is because those have been merged into the longsword. This is done for simplicity's sake, and doesn't remove those (or the katana) from the game - they've just become the flavour of your weapon rather than the name of it. There's no reason that Larian can't add a broadsword as a longsword without the versatile property (so only the two-handed option), or a bastard or hand-and-a-half sword. Gladius, katana, naginata, flail, nunchaku - they can all be done with a simple name change.
This is actually mentioned in the "Flavors of Fantasy: Wuxia" portion of Chapter 1 of the DMG, though it only gives the non-European weapon names.
