Just finished the job up. Used 1 liter of Motul factory line 5W oil between the two forks. Needed the special tool for sure. Got the motion pro tool for removing the cap as well, it came in handy so I didn't scratch up the cap just using an adjustable wrench...which would have worked I think.
So, just posting this up for future reference. To perform the fork oil change on the big pistons forks you need:
1 liter fork oil (services 2 forks)
Fork cap wrench or socket (8-sided)
Case guide wrench (race tech seems to be the cheapest, it's a good tool)
Fork oil level gauge/syringe tool
+tools to remove front wheel and forks from bike.
FYI, these are the same tools you need to change out your springs, or do any work on the forks in general.