...Question is can I do the nut cage mod without removing the rear fender section? It certainly might be a little cumbersome with the fender still on but with the tire off and a small cutoff wheel to split the cage I am thinking it might not be so bad. Anyone else done it that way?
That's exactly how I did it a few weeks ago.
Used a Dremel to cut it, then a screw driver to split it, then pliers to pry it back and forth till it broke off. Then used a big grinder to grind the weld/remaining metal smoother to the fender. Touched up the paint with regular automotive black and was good to go.
Did all of it lying on my back on the garage floor with the Valk on a jack/jackstands. Remember to wear safety googles as some crap will fall down on you.