About ElvUI

The only thing I can think of is using a shift modifier macro for each spell.

#showtooltip
/use [mod:shift] Survival Instincts; Barkskin

What that will do is show barkskin on bar you place it on and when pressing shift it shows survival Instincts.  I don't think this is what you wanted, but I'm not sure if Elv can do what you ask.  

You can try messing with the visibility states under each action bar.  Though I don't know how to make it work the way you want.

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