Joh
What is needed is a force which increase with the distance. I do not know any.
There are only 4 fundamental forces in the universe, and each is inversely proportional to the square of the distance. However, each scales its field strength at a different range.
Proposal: Weak nuclear force repels opposite color quarks. We construct the bands of an exotic matter with one comprised of up quarks, the other of down quarks. Then we give each an opposite electric charge. Weak force will repel them to a certain distance, and then electromagnetic force takes over, holding them in a defined equilibrium.