I think that you could take the bladder out the Atoll and put a foam kick board inside it instead.
Great idea...Never thought of that but I'm sure that could work nicely.
http://www.omerdiving.com/ing/atoll_sch.html
The hunter float is about twice the size of the atoll float and could support more weight- as in more lost anchor finds.
You don't by chance know the dimensions of it? Omer's website displaying the specifics aren't very helpful (image too small to read) Could you ball park it?
http://www.omerdiving.com/ing/atoll_sch.html