Thank you Tim. Do you get TbT details when navigating back to a saved location? Or does it need to be a saved course in GC exported to the watch? (in which case your proposed 'two courses' solution would seem to be the only way to go)
You also get some "turn" info if you do this somewhat simpler process:
Create a course in GC either using the course creator or from a previous activity.
Send it to your 735 from the mobile app.
It then, well for me it did, inserted course points as pseudo turn markers. This means when you start a course you get a distance to the next turn and an arrow of what direction to take. You could of course also see the direction to follow by looking at the map page and using zoom as appropriate.