I know how to do it, does anyone know the exact size of the huge hex tool I'll need to remove the front axle from the forks and wheel?

Once you remove the bolt, you can just push the axle out...that's what I did.

yep. dont even worry about the hex.
Remove the bolt on the other side, loosen the pinch bolts, push the axle out while supporting the wheel..

1 place front forks on front lift/stand.
2 loosen the brake calipers/fender attach and tie with a shop rag to aviod scratches on your rims.
3 remove the bolt from the r.h side -22mm *I think
4 loosen the pinch bolts on the bottom of the forks.
5 slide out the axle
6 holding the brake calipers away - remove the wheel.
7 check / confirm left and right side to install as same.