Drain and isolate are two different concepts. Drain removes internal vibrations and isolation prevents external vibrations from entering (as well as keeping internal vibrations trapped). I would not recommend using cork or rubber next to the component since that will trap (isolate) the vibrations internally. Symposium makes effective platforms that do both by using a metal to drain (remove) internal vibrations and foam to isolate and convert vibrations. Try using a piece of stainless steel (non-magnetic) on top of wood along with SS couplers. Or use aluminum if that's easier to get you hands on.
