Subject: [InfluxData Community] [Collect] Send same points to multiple measurements?

I can't think of any way this could be done.  As you were thinking, the only way to duplicate a metric is via multiple output plugins but the `name_override` and `tags` options are not available for outputs so you wouldn't be able to modify the duplicates.  Would be a great fit for an exec processor though, I'm hoping we can find the time to do this for 1.13.