There might be some 2 part wood filler type products that might be less stinky, also some epoxy putties might work too unless you need lots. Look for the wood filler at your lumber yard or home do it store. Might not be as hard if you need that.
I can't remember who, but someone here about a year ago made a substitute by mixing epoxy with talc. He said it was very similar to shape and sand but didn't stink, or shrink as much. He even had a Youtube video on it.