If you wanted, you could change the output keys.

Put your shamans in an Action Target Group.
And have your druid in one as well.

Then change the output on say FTL DPS 2.
So that it sends "2" to "Target: Druid ATG".
But it sends "1" to "Target: Shaman ATG".

Do that for as many hotkeys as your Druid has, that you want your shammies to Lightning Bolt on.