But it's the only format that can be used to verify a dump against the original. And can be converted to XISO fairly easily (with the right tools).
I can confirm that extract-xiso, with my fixes, can be used to convert also this game.
The command I use is the following:
extract-xiso.exe -r -m "MyGame.iso"
-r rewites the ISO, while -m disables automatic xbe patching (it shouldn't be necessary when running from XISO, but I could be wrong here).
As for the splitting part, I use GNU split, but any file splitter can be used, as long as you split on a 2 kB (2048 B) boundary. I usually split at the 4 GB - 64 kB (4294901760 B) mark, to minimize fragmentation with any HDD sector size.