You can actually already do this Emily W.; pretty handy feature I discovered a couple of weeks back called 'Create Event Property' that allows you to make a derived event property using an OR clause (& many other options)
My only ask would be to prioritise defined Event Owners in the Context box, moreso than Users who've recently queried (new people query stuff w. out really knowing what they're doing, and it picks up queries when loading a pre-built dashboard).
Neha N. although we do track UTM parameters in page events, most of our 'conversion' events are tracked server-side so don't include UTMs.
Would that inhibit out ability to create multi-touch attribution funnels like this, if say the 'Sign Up Completed' & 'First Purchase' events didn't have UTM parameters included?
