Spokes that break on the front wheel or non-drive side of the rear wheel are much easier to deal with than drive-side rear wheel broken spokes. I've also heard that it is more common to break drive-side than non-drive-side rear spokes. A couple of spare spokes and a spoke tool are light enough to carry. However, the chain whip and locknut tools are not.

Do you carry a chain whip and locknut tool with you? From the list of gear that people show or recommend for touring, neither seem to be part of the gear. Maybe it doesn't happen very often that spokes are broken but you never know.