I don’t know how chainmail-specific your wish is, but there are plenty of weighted blankets for sale. Most of them have thousands of tiny heavy beads sewn into a quilted fabric that keeps them from moving around or bunching up too much. The one I have weighs about 8 lbs in Queen size and it feels, weight-wise, similar to the feeling of having four or five extra blankets on the bed but without all the heat/insulation of doing that.
Mind if I just jump in here and praise your username?
And yeah, I wonder if that medication is from Europe, thinking the word may not have the same cultural baggage in many countries there and might only refer to the original meaning of the action of slowing or moderating.