Can Vivosmart 5 track indoor rowing activity whilst connected via ANT+ (broadcasting HR) to rowing machine

Just purchased a Vivosmart 5 because we have a Concept2 rowing machine which uses ANT+ and my partner has a Phoenix that connects and can record activities at the same time.

 I wanted to record my indoor rowing as he does, with distance traveled etc., and see my heart rate on the rower.

I can connect to the rower if I broadcast HR, but then there is no way to start an activity without stopping the broadcast.  The MoveIQ doesn't detect rowing at all, so no activity is logged.

I can start the indoor rowing activity but then I cannot broadcast HR to the rower without stopping the activity.  Tracking the rowing without a connection to the Concept2 means I get no distance traveled or average pace etc. in the app whereas my partners Phoenix does.

Unless there is a fix for this then I have been mis-sold a vivosmart 5 as capable of ANT+ AND capable of tracking indoor rowing as it appears it can only do one or the other.

What am I missing?