The fenced hunting portion of those regs was meant to shut down high fenced hunting of hogs and exotics.(1990's) There was an operation in Coloma for example, that had wild boar hunts, and that went bye bye. Wisconsin, to my knowledge doesn't limit hog farms or how you market and sell them, like Michigan tried to do. I would contact my county ag agent, and pick his or her brain.
"...And there came a voice to him, Rise, Peter; kill, and eat." Acts 10:13