Hey grego,sorry to hear bout your friend.
Thats sad actually.
I dunno if this will work but its just a thought.
You get those spray cans that spray i kind of polystyrene gel that solidifies after a while,they use it for refrigeration.
Maybe you could spray sum of that stuf in the hole an dit wil fill the core,and solidify.its just a theory,the best i can think of.
Or you can pm Tamega and ask him to ask rossi about it.
i just had a board made by him and it is sick!
Thats why we keep it local buddy,so that problems like this can be sorted out

Pity
Best of luck