[Blindstitch]

I may be wrong on this but I believe the front doesn't have any sort of retaining nut. It's the rear that does.

 

[Blindstitch]

It's #7 on the rear.

 

[Blindstitch]

My bad. The cx's don't have retainers on the front.



These guys seem to have a similar problem even though it's not a motorcycle.

http://www.patrol4x4.com/forum/nissan-patrol-gu-gr-10/wheel-bearing-retainer-tool-front-21142/



This idea seems to be the cheapest/simplest one without a welder. Short bolts with nuts on them would work just fine.