Could someone please explain what a party proc warning is? I'm not sure I have the right thing in mind. I was thinking you're asking about some proc that a player in the party has active, a.k.a, an aura.
If so, that is beyond the scope of Hermes current message protocol. Which would mean something in the future, if at all. As you know, requiring people to use addons is bad enough. A constantly changing protocol forcing upgrades needs to be avoided at all costs.
It's possible to be done though. I would start to get worried about the amount of messages sent between players at that point.
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