Congratulations, Foreback123 on your further working on being pulled back! While coronal rings of various sorts will assist in retaining a pulled back state, they do, unfortunately little for the permanent state you wish. You indicate that you are a grower. This is a further hindrance due to the fact that you have less shaft for wrinkles to form on to absorb the space the foreskin occupies. The best that I can suggest is using a good quality adhesive type tape. I would have it in long narrow strips, attaching each strip near the tip of the prepuce and pull the tape back forming deep shaft wrinkles on the shaft and anchoring it on the main groin skin. You would likely need to do this for at least six months, or longer, for deep wrinkles to form. Should you be able to form them, they will stay formed forever, unless you choose to be an intermittent pulled back, and then all your efforts would be for nothing. If you are able to develop these deep wrinkles, you would not need to continue using the tape method. You may need to do a little experimenting to find what works the best for you.
Glans peeling is what some new to being pulled back go through for a short term until the glans becomes properly keratinized. On the short term you will likely find the foreskin will become puffy due to the exposure. Over time this puffiness should reduce making the staying back even easier yet.
Hang in there, and all the best on your effort!