Oh ok i thought it was just the one FAT32 partition you were after.
For multiple partitions like that i always use a program called Paragon Partition Manager 9.
It allows you to choose the size of each partition and also the format. I dont know if there is a free or trial version as mine is the paid version.
Also i am not sure if you will have problems with the consoles, primarily the wii console, finding the 3rd partition after the first 2 that are not WBFS - i dont know as ive never tried it.