Going to slightly deviate this, does anyone use Suprem + Imp's mass dispel on occasion? I know it's hp is terrible, but it's damage is double that of the Observer and the mass dispell on 3 friendlies is incredible assuming it isn't killed before use + a little hot now and again is never a bad thing. Contemplating trying a few games where I'll SB summon it to free my healer from CC, seems extremely powerful if utilized well
If you really choose to not play a pet vs a cleave and you feel like you need a dispell, instead of using supremacy talent, use the sacrifice and sacrifice a normal imp. This will give you command demon.
A macro like this will dispell your healer for 1 ability, so use it smart:
/cast [target=yourhealernamehere] command demon
It also has a 10 second cooldown, most of the time vs cleavs id still choose to go for the 30% midigation that glyph of eternal resolve + soul link. If they kill your obsever that you will get more preassure from, go behind a pillar and summon a void lord. This thing is tanky, and provides the ability to disarm the cleavers. (might have to soulburn this)