For the axle nut, a center punch works fine. Just drive it in a little. If you have a 6 point socket and large breaker bar you can just back it off. No damage to the threads.
Best bet for the axle, would be to get a set of both and take the inner CV joint off and swap them. I believe the spline count is the same, but I could be wrong. A bit of time at the you pull and pay where you could investigate would be best.