What are you going to use to keep the hooks from pulling out of the foam?
Even screw hooks will pull out of foam after awhile unless they are screwed into something more substantial or have some kind of backer plate behind the foam...
I found these today at Michaels I cut the little ball off works perfectly. I don't have the correct foam like a normal fly box has this works though the top/foam will be glued in so it don't come out from the top.