I understand why this would be useful, but I’m not sure this is the right thing for us to be building now, to be honest. It’s an extremely one-off use-case (I think) and only needed as another really good feature (DRS) hasn’t been built yet and building this would only delay building the actual DRS feature.
We’ve also got a request which we’re keen to get to, for more advanced reporting and customisable dashboards which would likely cover this situation too - Dashboard customisation with custom KPIs & reports and if we built a specific feature to exclude some products from the dashboard now it would probably clash with the main task for dashboard customisation.
I’m sorry, I know this isn’t what you’d have wanted to hear, but I hope we have a solution for you before too long by way of those other features.