Check the addons + forum thread for LibGroupSocket. It is able to send a small amount of data to the other players in a group using MapPings.
Maybe a group ready check can do the trick for you as well by sending some info from one addon to another but not showing the ready check dialog (if this is still possible).
Be warned:
Both ways can kick you from the game if you send too many data requests in a short time, so killing a lot of people in a group could kick you or others from the client.
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