That is kind of neat.

Have the addon which is doing the announcement, on the toon with the proc.
So even if its not in the combat log, it is whispered to the correct toon.

With Jamba forwarding whispers to the active/master toon...
You wouldn't even care which toon received the whisper as long as one toon per team received it.

Or you could go with party chat.
The Random BG stuff, said you can queue as a group, up to a 5-man, which is the full team for most of us.
Hopefully that means each will be in the same group, for BG's.