Ah, went back to try "open behind" again, now I see the path
left side lever, back through middle to lower right, up right side to lever, over and up middle, just enough room to get by there!
Of course, I felt it was worth it to get those potions at the ends, and the first time I reached one of the ends I had just quick-saved and now was committed, so I got all prepped up to fight the tough ghosts which I had been putting off, worked out fun.
I didn't actually console search the chitin boots, just was missing them for a full set

Maybe you could add them (move them I guess) somewhere, replace some reward/treasure
I don't know what that missing treasure stat might have been. I did have the extra treasure relic item.
I guess I didn't really get all the secrets on my own, as I needed strong hints for about 3 of them.
PS - I realize sometimes in my notes of grammar corrections I added a ... in my quotes so I could type just a part of a sentence, but then later actual quoted "..." became an issue, and sometimes I didn't include false ... quotes and sometimes did - I hope this inconsistency on my part doesn't cause too much confusion!