Have you tried just placing your hand in the viv, palm up so that your beardie can investigate it? Maybe on the odd occassion, just place one tiny meal worm on ur hand, wait for your beardie to sit on your hand and then pull him out ... it might take some time though. Don't put a worm on every time, they are quite fattening.
1.0.0 Beardie - Max
0.1.0 Leopard Gecko - Willow