If you have anither good option who plays in/after the North game (eg Cripps) you can always switch to him if Scott is a late in.
Personally I think the type of trade you are looking at is almost never worth it, unless it's a 200+ type score and/or you are improving your side as well. The trade is worth 150+ points in my view, and you might get an expected 40 out of this one (160 - 120 out of another captain option).