The issue I'm trying to solve is that, in the Connect app (either on the web or my phone) my daily heart rate information is from the optical sensor only. This becomes a problem when I'm doing Zwift workouts because the optical sensor is pretty terrible during activities like this. Garmin will list the activity and its associated heart rate information but then also show the optical data from the same time and they're often 40 or 50 bpm different.
What I'd like to do is use any available external HR data as the default/override data during activities that have HR data so all of my stats on Connect are accurate; HR, Intensity minutes, etc.