Just a suggestion, but I'd try to dissuade him from climbing on your shoulder for now. If your bird is unsocialised and untrained, it can lead to some truly nasty and painful bites down the track. When you handle him, just quietly put him back on your wrist until he gets the message and stays there.
Since he's not responding to treats and is afraid of strange objects, I'd say he's feeling very new and nervous. If he's happy to sit still, why don't you just hold him for a while as you read or watch TV? If you read, then read aloud to him so he gets to know your voice and finds confidence in it. If not, then handle him for ten minutes or so at a time and just ask him to sit quietly on your wrist. Always move slowly and confidently around him and don't allow any loud or sudden noises or movements. Try to be alone with him during these times.
Watch him, too, for signs of fear or anger. You'll get to know each other very quickly and it won't be long before he's responding to you. I'd give him two or three weeks to feel entirely at home (it might take longer, but see how you go). To start, keep him in one part of the house and always work quietly and slowly with him. If you use a chopstick for target training, why don't you put a few in his cage so he can get used to them? See if you can wedge one across a corner so he gets to see and chew on it. If you leave them on the floor, he probably won't notice them.
Do keep asking questions (as they say on Sesame Street: it's the best way to find out what you want to know) - happy to help!