I don't think you can speed up the process. You just keep taking him to places where you have a certain amount of control over how many people approach him. When people ask, "can I pet" tell them that this is a no petting dog, especially if he is being trained for service. As them to not look at him, either, as you have him sit by your side.
My she-pup does not like long eye contact with strangers. I have to establish the 3 second look. I may actually count to three and then ask folks to look up, then reward my gal when she focuses on me and ignores them. Kinda like the 3 second meet and greet my little rescue dog did. If someone wanted our dogs to meet I gave them 3 seconds to sniff and then said out loud, "that's good, lets go". That helped my other dog a bit with strange dogs. I am hoping it will help my gal with friendly strangers. It might work for your boy.
Patton CGC BH
Chief one and a half years old
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