Creating a server-side events funnel is something I'm asking around about. Unfortunately it won't help with user privacy, but it would at least lighten the page weight.

Though from what it sounds like, this has to be done case-by-case (arduous) and not all vendors support it. Is there a generalized solution for doing that?

Edit: actually maybe it could help with user privacy. If we're only sending over the necessary data to track conversions, instead of letting eg. TikTok run arbitrary code on every page our users visit, that's probably still a win.