the Gnomesequencer addon is your friend. For example here is a "round robin" interrupt:
TL;DR, 1st press triggers Rebuke, presses 2-5 attempt to trigger Blessed Hammer. Then your other toons would have the interrupt on different lines, so only one gets triggered per press and the other characters attempt to cast some basic spell. Whether the spell goes off does not matter for the addon, it will drop to the next line after each press (as long as it is set to sequential).
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