Drat - the small 70mm Nikor tank just misses being big enough for the Hewes reel (see pic). The search for a tank continues.
I do also have the massive Nikor 3-nesting-tanks-with agitator-lid set but haven't picked up a 35mm reel for it yet. Just have the 16mm and what was purported to be 70mm but measures more like 120 (which would be weird to have that much length of 120 width film!) plus the loader.