My paladin has a 96969 macro, on key 1.
The spacegirls she groups with have a click castsequence also on 1.

My mixed team tank needs three keys to tank.
I have a Mangle-Maul-Maul on 1.
I have a Faerie Fire (once) and Lacerate key on 2.
And Swipe spam on 3.
With the DPS on the team getting their click sequences on all three keys.

Use whatever keys work for you.

I'm using ISBoxer for my software solution.
So any toon can click on my Grid display, and pass the click to the healer.
Who via Clique then casts whatever heal is bound to that click (Left Click = Renew; Alt + Left Click = PW: Shield etc).