If the reforms are embodied in the company's charter, they will follow the shares wherever they are traded
Good governance means, in part, shifting the power structures of the corporation to make it easier to do the good and harder to do the bad kinds of activism.
So long as a company adheres to those principles, it doesn't matter if an individual investor can obtain their shares via ShortTermScumbags.com or the like. Having investors who are along for the long haul is a nice-to-have, not a must-have, since the goal is long-term focused companies which will naturally, via its principles, eschew reacting to short-term trends in share price.