Requiring consensus seems unnecessary. If we get one vote between us, then we get to vote once; that's all the legal system has to concern itself with. Everything else is our own problem.

The courts have no interest in whether we agreed on a result, or whether one of us is currently chained to the wall in our basement, or whatever. (Well, the courts may have an interest in the latter for other reasons, but not as it applies to voting.)

I agree with your suggestion; I'm just saying this isn't a legal complication, just a bit of good personal advice. (That said, my husband and I didn't sign a prenuptual agreement when we got married, so my agreement with this advice is clearly relatively superficial.)