Below is a town map of the lay of the partisan land in the 2004 POTUS election. And yes, it will be a challenge to leash the Dems to two seats, leaving the balance comfortably GOP, or at least for all the GOP incumbents, with CD-03 maybe marginal to tilt GOP. But it can be done. What needs to be done, is to have the GOP heartland outside Milwaukee and farther north on the east side of the state, all join in to chop up the Dem areas outside the Dane and environs red zone per the map (inner city Milwaukee of course having its own CD). I take your point about Dane. The whole county considers the GOP to be armed and dangerous and nutter, as it were.
That would take one hell of a nasty gerrymander. Even a plan that primaries Baldwin and Kind requires a sizable chunk of Dane County to be excluded, and you're still left with places like Eau Claire and Superior.