Ron-

With regard to them shifting rhymes in "Bolivar," I would be sorely tempted to resort the lines so they all run AABB. I probably would end up dropping a few lines or verses as well, so that one ends up with a more manageable song. This kind of crude surgery, of course, is not to everyone's taste (Meddle with Kipling! How dare you?).

My favorite tune for now would be "On the Range of the Buffalo" but others would work as well.

Cheerily,
Charley Noble