I own shares of past companies I've worked at, but I don't have any representation in how the company is run. It doesn't matter if my interests have diverged from current workers, because I have no influence.
If a company compensates its employees partially with RSUs, and those employees own and can eventually transfer those shares freely, and the company was also democratically governed by its workers ... could you not have "real" ownership (by current and past workers) and still protect current workers' democratic governance?