Sometimes I ride with Zwift alone, but sometimes I dual record with an app like TrainerRoad. I choose to have the TrainerRoad ride get posted to my garmin and strava profiles in that case, but obviously if I’m not dual recording, would like the zwift ride to update. At the moment, my choices are either Save (which uploads to connected platforms) or Discard. Currently I’m discarding, which I don’t really want to do. Instead I would rather another button or a checkbox that would allow me to save to Zwift, but not upload to connected platforms.
I don’t know if the TR/Zwift example is your only issue but, if so, why not just have the TR workout pushed to Zwift, and then just do the ride in Zwift without the need to dual-record the activity?
I tried that for a while, but just prefer the visualization of the trainer road app when I’m suffering. And I also prefer the thumbnail that Trainer Road posts to my feed rather than Zwift. It lets me see at a glance the type of workout I did.
Probably why long ago I decided to not connect Zwift to other apps. Rather I chose to connect other apps to Garmin, and when I want a Zwift ride shared to my other apps, I’ll manually download the Zwift FIT file and import it into Garmin Connect.