An answer on Reverse Course on device? NO?? (which is locked and cannot be answered, unfortunately) :
Reversing a course for full navigation is not possible, however what saved me yesterday on the road, and worked well for me was following on the device
- open the course you want to reverse
- go to Settings of the particular course
- set the course to 'Show always on map'
- select a color that gives good contrast, like red
Now there is a line on the map, that is easy to follow for the ride back to the starting point.