I had to go look at a Mertteli thread stand, as I have not heard of one. I am afraid I have no suggestions, though I am anxious to see what answers you get. I think the thread stand you describe that you already has is like the one I have. I had not thought about it twisting the thread, though I suppose it does.
I have seen some ladies who just put their thread in a tall mug, but I don't think that is the answer for you. I am sure someone here will have some ideas.
Dina