Chev
I cannot tell you about OAP, but as for Langley standard approach....

One person told me just do it, it is obvious. I thought that was snarky, but it was true.

Think veer left and you will be just fine.

At the beginning of the steeper bank and rocks, we ended up at one of the 8 ft tall cairns not even trying to. The single trail just leads there anyway. Sort of dead center in the picture below.

At that point we did have a quandry. It seemed like that cairn stupidly dead ended us. Going around left of the cairn was a third class move over a drop off. No go. Going up and to the right was what I did. On the way back down we realized that straight up above the cairn through an obvious but narrow slot for 10 to 20 ft was the actual route. I suppose that might be considered class 3, very short and easy coming down it. I did not go up it as it seemed awkward. Again, we avoided it. This was the ONLY area that was any issue.

After that, it does not matter. It is all wide open easy terrain, easy class 2 at the most, just sand, small rocks, and lots of use trails intertwining, or none at all. We did not aim straight for the summit unseen from there, but took an easier long zigzag to the far left toward small pinnacles on the skyline, then back around right along the cliff top to the summit. Coming back down we just came straight down to that slot I mentioned.

Sorry, I do not have a useful picture, but this one was sent to me by Karin or Tracie. The left route is what they did going up (and Dan and I went to the skyline twice as far further left), the right line is the way straight (can be used for either up or down). The important thing is to not get into the steeper terrain and cliff way, way, way over to the right. I do not see how anyone accidentally gets over there. Your eye and feet for the obvious way up on the standard approach just do not go there.
Think left. Sorry. I cannot tell where the 5 or 6 eight ft tall cairns are on the picture.

Picture and route from Karin and/or Tracie


Edit
Here is a picture of mine that might help. It was taken from NAP. The obvious trail takes you straight, then as it steepens it veers left a bit, aiming for the less steep left side of the cliff band. It is nowhere as steep as it looks, at least on the left. Again follow the obvious use trails and footprints. After the short crux of the route (the cairn and going around it that I mentioned before) we headed further left than most people do toward the small pinnacles on the left skyline, then cut right across the cliffs to the summit, then did not retrace our steps going down, but came more or less straight following lots and lots of use trails in the sand, back to that cairn. Easy stuff. Plus, at some point we could see that important cairn on the way down. If good visibility and daylight, then it is a walk in the park.