It was I who mentioned hydraulics. What you say will work: we have the entire outside diameter of the current springs available for a hydraulic cylinder. Despite the tiny travel it has enough piston area to displace a decent amount of fluid, so damping valves can work simply plumbed between the primary and secondary cylinders. The secondary cylinders act directly on coil springs of whatever configuration one wants, mounted wherever one wants, without the need for separate dampers. The only concern I have here is with the durability of the hydraulic seals. My first idea was merely to use a large hydraulic cylinder connected to damping valves and a reservoir in lieu of dampers. That way the weight of the front end is not supported on hydraulic pressure. As the seals wear the damping action will deteriorate as it does with conventional dampers, but the front end won't begin to sag or anything. Your way one can run bigger hydraulic cylinders and get greater fluid displacements, so within the limitations of seal life it can work very well indeed.