Autofilter Channel Posts

We manage a variety of digital products for a large user base across many different countries and want to curate our comms to limit irrelevant posts reaching users unnecessarily.  For example a post about "Product A affecting Country X" should not reach "Country Y". What is the best practice here? Currently we've opted for a central channel with tags to assist users in managing their notifications, but they will still see all posts when visiting the channel and will need to self-filter. Is there a way for us to configure the channel so they only see posts they are tagged in? I know we could set up individual channels for each Product+Country combination but then any common posts we make would need to be duplicated into each channel separately. Thinking out loud, I suppose if we automate our posts with a workflow/AI then discrete channels is a good solution to keep things organised. Any ideas or feedback please?