If you run the Advanced Song Chooser on one instance, you can then use OSC Sync to keep the second instance in sync when the Advanced Song Chooser updates the 1st instance (see this post for a bit of info on syncing: Sync Instances - new 4.7 feature)
I’m pretty sure the virus detection is a false positive. I’ve not encountered that myself with Bitdefender. Which AV package are you using?