Leopard gecko with MBD feeding

Anybody have some tips for helping my gecko eat? I received him like this from a friend. He has legs and back problems so it's a little hard for him to catch prey and possible soft jaws as well because the crickets he does manage to catch have gotten away. I've been making do with pinching th crickets in my fingers and letting him take them that way. Is there any diet that could set him on the road to recovery to the point he may one day be able to catch prey on his own or should I just continue hand feeding? I've begun dusting the crickets with rep-cal with vitamin D3 whenever I feed him and leave a small amount of powder in his cage for him to lick