David,
What you are proposing is a discussion group afaics, but more
complicated. It would also be open to spamming I imagine.
The messages coming in through the integration can be moderated to prevent spamming; just as ordinary group messages can be.
For the other people it is simpler than a discussion group: they didn't have to join anything nor deal with extraneous messages (announcements about others). And it isn't that much more complicated for you - set up the integration and after that the group operates in a normal fashion.
The key distinction, over what you're doing, is that the others initiate the messages - which may be a bad thing if you prefer acting as curator and author of the announcements.
Shal
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