Thank you for your post.
At the moment there isn't a way to meld walls joined together like in the image you provided. What I would recommend to do to get closer to the result you're after is to do what you said and go into the structure of the wall and move the studs around as how you've joined them already is pretty much what we would do as well. Please not that any manual edits will be lost if you edit the wall with a PlusSpec tool.
I would be happy to assist you if you have any further enquiries.