I made a repository for these – or at least the lower resolution variety in the case of the DEMs.
Jupyter notebook here re: merging tiles for the high resolution DEM. Not got around to the point clouds as yet – and this may do for game purposes anyway.
The HexKit map and derivatives are in the Australia folder. https://github.com/bluetyson/Dungeon23-Mokuy/tree/main/Australia
The 3D models are in the Lord Howe Island Folder. https://github.com/bluetyson/Dungeon23-Mokuy/tree/main/Lord%20Howe%20Island