At my last job we ran into the same issue you're going through and also wanted to limit the amount of client-side tracking scripts running on page-load. We ende

At my last job we ran into the same issue you're going through and also wanted to limit the amount of client-side tracking scripts running on page-load. We ended up using Segment (https://segment.com/ https://segment.com/) to act as an Event hub and they have integrations with Facebook, Google Analytics, and other platforms to forward events to. It worked well once you get through the pain of setup and any incorrect configurations. If I remember correctly, it wasn't a complete replacement for things like Google Tag Manager if you're using that but it certainly replaced many event tracking calls for a single event tracking call.