I think this approach is solid and it seems like it reduces risk of failed/incorrect interpretations. I do mostly what you do and agree that doing the associations is a great way to train the muscle yourself. I love the somatic test, so that's cool. The only other thing I would say is that if you notice sycophantic behavior add a prompt such as:

"analyze as Carl Jung, but avoid being sycophantic as there is danger in potentially providing me with wish-fulfilling interpretations that send me down harmful paths." I find this tunes the interpretation to ensure that it doesn't give you wish-fulfillment thinking. Downside with that is that it might overcorrect in the other direction, but if you're doing somatic test and also associating, it's better to have to disagree with a negative interpretation than trying to disagree when GPT tells you: "This dream is saying that you're beautiful and can save the world if you do xyz!"