Fisher made fireplace inserts and also the papa bear had a rear exiting flue which could be run up a chimney and all Fisher stoves had a flat top that works great for cooking but no oven. I have used mine as an oven though by simply putting a wire rack on the top of the stove and using a cover. I also use a dutch oven on top of our wood stove.
Never heard of a wood cook stove insert though. As far as converting an insert to a wood stove, my neighbor heats his house with an insert just using it as a freestanding stove.
If I am not for myself, who will be for me?
If I am only for myself, what am I?
If not now, when?
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Wood Gasifier Builder's Bible, Ben Peterson --ebook