The deck on this one cracked where the sailor's heel rests. Opened up it and dug out the crushed foam. It's an odd shape. I guess I'd like to glue styro in but I don't know where to get good styro in Brisbane and the odd shape might make it hard to fit closely. Any suggestions? Can expanding foam be used to fill this space? What type?

I have divinycel and carbon to go over the top.