My usual trick for holding CV axles in place to remove nuts or reinstall/torque is to put a screwdriver into the brake rotor and wedge it up against the caliper. This is the same trick for torqueing the big CV nuts on the end.

 

i applaud you if you can loosen a properly torqued axle nut with that ratchet lol

 

LOL my old Accord the CV axle nut was torqued to 95ft-lbs. Not sure what the G/Z spec is
The only way I could break them loose was by putting the handle of my floor jack on the longest breaker bar I have and practically jumping on it.

 

That wasn't my picture but I could definitely pop any axle nut with a 1/2" drive ratchet, I either sleeve a piece of pipe over the handle to make it longer or I just hammer the end of the ratchet handle with a mini sledge until it comes off. Literally done it both ways several dozen times depending on the tools folks have.

Obviously at my shop I just air wrench them off though.

Either way the picture was about jamming the screwdriver in the vent slots of the rotor and wedging it up to the caliper to keep it from turning.