@Mystery I have not looked into it, but I will do some research about it.
It has really helped me access what you are asking about your inner child. I rarely do it ever at the moment because I'm in functioning and reaching for goals mode and don't want to destabilize.
I met a couple of New Age healers in the 90's, the guy was a clinical psych as well and his female partner had all sorts of main stream and non mainstream healing qualifications. They put their knowledge together and did men's and women's workshops.
What they both taught was a simple ABC method of accessing your higher self (the bit that's got it's act together and is all knowing) kind of like the ancient wisdom that's in your genes. So they taught you to get in a relaxed state with eyes closed, breathing and relaxing your muscles on the ground. See yourself in a safe, empty room with a wardrobe in it.
You enter the wardrobe, walk through the door in the back of it, closing the front door behind you and walk down an ancient spiral staircase that ends in a platform with a boat jetty, with a small boat that you get in that's going to take you somewhere special. You take in your surroundings and trust the boat gently taking you to another shallow shore. You can use this journey to go to any part of your subconscious, you just go back the way you came.
I also use it to access a long corridor with closed doors lining both sides. Written on each door is one word or subject. I can go in there and look at a subject or I can leave it stored in there forever if I want.
With the wise woman/man one, you get out and the new shore and walk into a field. There is a house in the distance where the wise man lives if your a man, wise woman, if you are female.
The first time you do it is interesting because you don't know who or what you are going to meet. Then if you can set the scene as a part of your subconscious you access it quickly after that and go to the house whenever you have a quesiton. I was able to do that and got heaps of great answers from the wise woman to questions. Also heaps of hugs and holding.
So the reason I told you that, was that one day I went there and had it sprung on me, at the door that me as a child was there with the wise woman. So that was a meeting. Then I sat her down and told her things and comforted her. I'm can go there any time now and I think that it's a healthy thing for me.
Like all inner work, you have to be up for your reactions afterward but if you are already a strong adult survivor, you will have the parts that can do all that subconscious splitting and communicating. I found meeting and leaving my inner child in that beautiful safe place was really good for me. I have gone there at times and sang and played with her outside. When I first met her she was even scared of me and hid behind the wise woman.