If you've been feeding him on the plate, you can try using a smaller and smaller version of the plate and attach it to the lure. If you're around quite often during the day, the food in front of them all the time is actually not as good an idea as it could be. Yes, it does allow them to eat when they're hungry. But, it doesn't make them develop an eye for the things that mean food. What I've been doing with my imprint Cooper's (who is developmentally a little further along than your bird...he make short flights and is very active now), is I would put his food on a plate. Initially I would be happy if he fed himself from the plate. I kept the food ground until just a few days ago by the way. So, as time went on and he could feed himself, then I started placing the food some distance from him as I distracted him with my hand or something, perhaps he was napping. When he would awake and see it, or turn his head to look behind him after I had walked away, he would crawl over to the plate. This went on for a couple of weeks.
Then I began placing his food plate on top of the lure, and I would place it behind him as usual, some distance away. He would then run over to it when he saw it. I would let him eat the ground food and top him off by hand at the end, remove the plate and lure. A few hours later, repeat, I started adding a feeding whistle recently as well. He will now be on the back of a lawn chair in the weathering area, some distance (five feet or so) from a table I have out there with the bath pan on it. He travels back and forth between the two lawn chairs and the table quite easily now. Periodically I go out and visit with him, pick him up on the glove, and sometimes I will lay the lure out on the table shielding the action by holding him closer to my body on the glove or just putting my body between his chair and the table. Then I plant the lure, make the feeding whistle and get out of the way. In this way he goes to the food, away from me. But by being on the table he isn't threatened by me standing over him at this point.
Accipiters can be quite shy and reserved when they are young, especially if you don't trigger their real hunger (which I try to avoid as long as possible). I try hard to make sure they get plenty of food during the day, but also I am conscious of tweaking the amounts so that he might get a little hungrier as it approaches the time of day that I will likely be flying him (although its so hot here now I won't likely fly in the evening, even though I am giving him his largest meal at that time). Right now that evening focus is to try to knock back that evening accipiter over-active period they seem to have. So I feed him very well, and then take him back to his tank and his nest bowl, cover the top with some barred metal shelving piece and then cover much of the sides and half the top with an old shirt. He's eaten, he's back in the house where its much cooler, and the visual corridor is greatly reduced. He usually just lays down and preens and dozes off until morning.
At dawn he's ready to go back out to his weathering yard and get busy. I wait until he casts his pellet and then proceed again. Here's a little video of how that all started. Sorry for the quality, I don't know if that's my phone doing that in the transfer process or what? There are other videos of him as he has progressed on there as well. Feel free to check them out. https://vimeo.com/129351959