I’ve done this in the past myself. Even journaling while sitting in my car by the mountains. It definitely helps you reconnect with your core.
I used to have this book. I did get some use out of it. I find it interesting that you mentioned it. I don’t know of anyone else online who has referenced it.
I took a different approach where instead of trying to be all 4, I identified my strongest archetype and worked to express it more purely. But to each there own. Subbed to this journal.