My view is this, We do have constitutional carry in as much as article 1 section 25 states, The people have the right to keep and bear arms for security, defense, hunting, recreation or any other lawful purpose. WISC. CONST. art. 1, Sec. 25
There is no mention in manner of carry, open or concealed.
Now if you want to play with words or meaning you could argue that
keep and bear arms for security, defense, hunting, recreation or any other lawful purpose is a manner of carry, And Art. 1 Sec. 25 would be the lawful manner of carry.
The State statutes restrict that right of security and defense While in a state parks, in a school zone, in your vehicle, in establishment with a class b license without consent, and in Gov. buildings and here is where common sense fails, You can be armed in a school zone while on private property, You can be armed standing next to your vehicle, You can go armed state parks as long as it is open for hunting and you have a license to hunt that game, You can go armed outside of Gov. buildings. you may go armed in your buisiness or upon your property concealed.
The statutes are the problem they conflict with Art. 1 Sec. 25.