No pictures, sorry!
Crawled under the axle and started Dremel'ing off surface rust from various areas. There was a track of rust following a few seams. Followed it up by taping and spraying. Took a good while to show some progress. After, I got after the AHC system, which is in the same shape many of the KDSS you've all shown. I ensured I was still able move the release valve before getting to work. Then went to town taping and spraying.
The AHC area is so dang tight, I couldn't get a wire brush or Dremel bit in there. Hoping the rust reformer will hold up.
Definitely time consuming but, ultimately gratifying knowing that there should be less issues down the road.