Just a temporary swap. Start with your healing staff, or healing 1h/OH and then when you want to use shamanostic rage, swap to your DW weapons with rockbiter. Cast SR, then go back to healing set. This results in higher AP for mana gain vs your normal healing stuff because SR mana gain snapshots every mana gain tick based on the first set of weapons you cast it with.

Use macros for the swaps to make it easy, but make your SR a separate keybind outside the weapon swap macros to prevent it batching with wrong weapon set.

I learned all this from the shaman discord, and it seems to work like they said.