If you can access a lathe, machine up a couple of spacer rings to support the VS4 valves.
Outside Diameter = 36mm
Inside Diameter = 29.5mm
Height = 5mm
I made mine from mild steel and Silver Soldered them in place, but you can weld them if you wish, provided you file/machine the excess weld material and any spatter off. (Paying particular attention to the piston ring lands).
You could also make them from a non ferrous material, such as aluminium or PC, then glue them in place. Just ensure a suitable oil resistant adhesive is used, and that the surfaces are free of contamination, also the material used is strong enough to withstand the spring force etc.
While you have the damper rods out, take the opportunity to machine a light skim off the base. These rods come from the factory "rolled", and are not particularly accurate. A "LIGHT" skim will square them up, which will centralise them more accurately in the fork tube, allowing the piston ring to work more effectively, and also prevent the rods and VS4 valves from rubbing on the tubes.
BTW, I recently had my forks apart for servicing, and adjusted the spring tension on the VS4 valves from 3 turns, back to 2 1/2 turns...Suits the type of riding I do better.