BOAC
If you can't quantify the lateral separation, there isn't any. You have no idea at what point on the outbound and inbound legs the two aircraft will be so obviously the lateral separation can't be quantified. Also, what accuracy are you assuming the radial is being flown to? What radial is the aircraft returning to the VOR flying?
And here's a question for you. Lets say you are procedural. What is the required lateral separation? If you fly this plate as it is written you maintain separation. If you want continuous climb, request it. If you can't because the tower man was tipping back on his chair and fell over and banged his head, do what it says on the plate. It isn't ambiguous. Read the immediate action strip and read the briefing strip, in order, and do what it says.
I knew there was a reason teachers used to tell me not to tip back on my chair