Cast sequence in modifier?

Is there a way to make a modifier execute a cast sequence? For my destro lock I tried just doing /castsequence [mod:shift,nochanneling] Conflagrate, Chaos Bolt, Chaos Bolt
And the whole thing starts to break. In the sequence box i have just a basic cast sequence for maintaining immolate and building soul shards, i wanted to set it up where i can just press shift for my burst but it specifically uses conflag then 2 chaos bolts before restarting

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