I have a few thoughts there are a few flowages in northwest Wisconsin that have boat in campsites Turtle flambeau and chippewa and willow. A couple years back we rented a boat in one of the local towns and went out and camped on willow. Its not BW but you can find a semi secluded spot that you can camp.

If you want to do eastern Wisconsin there is good fishing to be had in the winnebago -poygan area. I think there is and ice fishing video on poygan in one of the previous seasons. Camping would be car camping/drive up camping. High cliff state park is nice. I am sure you can find a boat rental somewhere.

Good luck