I’ve never seen the controller present a ‘list’ of possible connections. Wouldn’t just setting the preferred device as the primary Bluetooth connection replace the older non+preferred version?

I’ll admit I do all connections from the sending device, rather than from the Sonos Roam, so I don’t think I’ve ever set a ‘primary’ connection. It’s whatever was connected last. And changes from iPhone to iPad, depending on which device I’m using to connect.