I've added more comments to the AfD page, including some helpful references for anyone seeking to write the suggested article on Scalar theories of gravitation.  Looks like another editor also provided some excellent references, although they are mostly not pure scalar theories of gravitation (as far as I can see).  Ooops, I also replied on my own talk page (how confusing!) saying you should to this because you'd almost certainly find it enjoyable/fun/a_valuable_learning_experience once you got started.-