Trouble adjusting Indian Ringneck to hands

My Indian Ringneck is a rescue that has been introduced to a lot of negative reinforcement. His last owner did a lot of inappropriate things to the little guy. Like hitting his feet with a stick if he didn't step up, or grab him by the wings and shove him, I really don't wanna list all the things he did.
I got him when he was 2 month old, he is 7 month old now. Things are going pretty well, he sits besides me on his perch and even sits on my computer monitor when I am working. But the problem is I can't approach him with my hands. I can get him to step up with a treat as long as I keep my distance and wait. Even when just giving him a treat I have to wait for him to approach me. As long as he is the one approaching it is fine, but if I try he will panic. Which is weird because he likes my company. He sits besides and even calls for me if I leave, but I cannot by any means approach him with my hands not even with a treat, but other body parts are okay. Does anyone have any tips on how to adjust him to my hands? This is not my first time taming a parrot but his hand fear is on a whole other level than any bird I have taken care of. Quick note I have also never had a Ringneck before.