I think it´s possible, specially if you make shamans insta cast healing wave on the pally when maelstrom weapon reaches 5 charges. Biggest problem imo will be healing the shamans in aoe bosses, as spirit wolves have a cooldown. though you may also create a healing macro for shamans to insta cast healing wave on theirselves, either way you will trade dps for survivability... Plus you have 4 totem sets at your disposal.

Cya.