I was messing about and came up with this, haven’t tried it properly but it seems to fire off ok
action bar 1
/targetenemy [noharm][dead]
/castsequence [@focus] reset=4 Earth Shield,null,
/castsequence [@Focus] reset=0.3 riptide,chainheal,lightning bolt
/swapactionbar 1 2
action bar 2
/castsequence [@focus] reset=0.3 Chain Heal,Riptide,healing surge
/castsequence reset=0.3 Lightning Bolt,unleash life
/swapactionbar 2 3
action bar 3
/targetenemy [noharm][dead]
/castsequence [@Focus] reset=0.3 Healing Stream Totem
/cast Ancestral Swiftness
/swapactionbar 3 1
please try it and let me know what you think
cheers