Brian,
I think you are on the right track.
I would go with extractors, if it were me. As you point out, extractor guns are easier to close. With my British A & D guns, I always feel like I am closing my ejector guns harder than I like to, as I push them closed to compress the ejector springs. Seems like it would be just a bit easier on the jointing of the gun with extractors, long term.
And you may save a couple of ounces by eliminating the ejector springs and kickers, if weight is a concern.
Another issue that no one has mentioned is that an extractor gun is quieter to reload. Not that it matters bird hunting, but why put up with the extra effort closing the gun, catching the empties, and the noise of ejectors, if you don't need them?
I simply cannot see any need for ejectors in the grouse/woodcock coverts.
