In addition to the hammer and doll, you can use a small flashlight, or a laser at 635 mn frequency, with the doll to stimulate any of the points used in Tong Ren. And if you have a client with an autoimmune condition, you can suggest that they stand in the shower and let the water pour down on the top of the thoracic spine.
For your clients with autoimmune conditions I recommend reading Donna Eden's books Energy Medicine and Energy Medicine for Women. Many of her recommended exercises are helpful, in particular the Daily Energy Routine. You can find you tubes of those exercises by googling "Donna Eden videos". Donna healed herself from a number of significant health concerns including multiple sclerosis.