/castsequence [target=player] reset=5 Blessing of Kings,,,
/castsequence [target=party1] reset=5 Blessing of Kings,,
/castsequence [target=party2] reset=5 Blessing of Kings,
/castsequence [target=party3] reset=5 Blessing of Kings

Gotta get an addon to extend the character limit, party1,2,3 etc can be toon names if you like. Dont spam it, press the button only after it has finished global cooldown.