My beardy refused to eat greens when I first got him. He actually went on a hunger strike for a few days upon arrival but then only ate protein. I tried to offer greens but he'd ignore them.
I tried a few tactics but the one that worked for me was indeed superworms in salad with the salad slightly dusted with the same calcium powder the worms had. Mine is significantly lighter than yours (only 12 oz) but he's fairly small (16").
I stopped feeding him daily but kept his greens bowl full with the light calcium dust. He caved and started eating the greens. I don't think I've seen him eat them without the calcium powder, but I don't put that much on it.
Also, try various greens. My dude straight up won't eat collard greens (which many people report their beardy will!) but he will eat Mustard greens, Turnip greens and snap peas (although the first two are most important). Also try to color it up a bit, my dude seems to notice the salad more often when there's mango, papaya, apple or bell pepper in it.