YP
Why start by telling the fo to do something at all? Why not say, "There's weather ahead - I'm thinking we should look to be 25 miles east of it. What do you think?
Not a bad tactic, and that's pretty much I would do ( sharing the mental model, etc ). But you still need to consider what you're going to do if the f/o is one of the very very few (<10%) who will argue the toss for the sake of it? As was pointed out to me in my Command upgrade years ago: "not all the a****holes are in the Left hand seat"?