Dog One, the offset you mention could be used to separate you, but only in certain circumstances. The scenario you mention involves climb/descent from an ad outside radar coverage. When you depart an aerodrome, you would have to track a pretty long way at 90º to your intended track to make it usefull.
My advice. If you are departing a non-controlled aerodrome and are advised of opposite direction traffic that may impede your climb profile/their descent profile, offer* to track outbound on a VOR radial that is at least 15º away from the inbound track. You will be separated from the inbound by 20 DME, can climb over him and then track direct to the next waypoint. If there is only a NDB, make the bearing ± 30º.
* offer does not constitute ATC approval.
* ATC may offer this to you anyway.