First, why would anyone do this?
Second, you always need to identify where you are and where you are going, so you must change an outbound to an inbound or vice versa.
do you have terrain information for being off airway if you truly intercepted, not on top of the navaid?
all of these exercises are sort of odd. but the easiest way is to draw a depiction
certainly moving map displays in the cockpit make it easier
and you can even imagine it on an old RMI
good luck