So I finally got around to replacing the rear VVTi oil line today and oh boy, what a doozy. I've never seen such bad design before, and not just one or two things. But the whole reason I have to replace the line in the first place is due to bad design so I guess it all makes sense.
All up I reckon it took me about 6 hours. I lost a fair bit of time on the bolts for the plastic cover over the oil line. I didn't even bother trying to put the rear bolt back after as there's just no way I can do it without better tools as I can't get my hand in there. I also lost a heap of time as whoever replaced the power steering pump put a bolt back that doesn't fit right. After fighting with it for like an hour I finally figured out that it's not the right bolt so it won't screw in all the way. The proper bolt is about 5 inches long so there's no way you could confuse it with another one. Some people just don't give a F. I also see why a number of videos I watched basically removed all of the steering elements as it's almost impossible to torque the rear banjo bolt with all that in the way. Got there in the end though.
On a final note, the rubber part that came off was still very flexible and in good condition, probably didn't need to be replaced but you can't know that until you've already taken it off. Car has done 160,000km so far and should be good for another 100,000km now.