The Mike New Technics Bearing
I'm not keen on the big rubber boot element of the plinth - but who knows, without experimenting, it may actually be ideal. The plinth is a reasonably simple construct - in terms of concept rather than realisation - a die-cast aluminium top with a large rubberised base screwed to it. It would be interesting to see if removing the rubber base sounded different/better/worse.
I would have thought any plinth would be a reversible mod as it all screws and bolts to the plinth - not so much if bits of it are now glued I suppose.