I haven't read all of the posts, so I apologize if this has already been posted. If I understand correctly, the premise of the USGA and R&A rule change is based on swing speeds. If that is correct, then don't change the ball, reduce swing speeds.
With the technology today, it is so easy to monitor a swing speed. If there is a maximum swing speed for elite (whatever the definition of elite turns out to be), then add weight, adjustable fins, scoops, or ???, to slow down the speed of a driver. Those more familiar with impact of aerodynamics/weight can chime in if this is a doable.
Maybe set a max swing speed with a + tolerance, based on technology reading error range. An example would be 125mph max swing speed with +2mph tolerance. "Maybe" allow a single swing exceeding the total allowable speed per round for a time when the golfer wants to really let it go.
John