It should provide for a relaxed sound.:-)
Aside from that, the sheer size of the cork block might be enough without the ribbed rubber that some footers use, but I'm not sure.
All the best,
"Yoga blocks would seem to be well suited as isolation devices. . Can't hurt to try."
Actually they don't seem well suited as isolation devices at all. Maybe you meant to say coupling devices. Perhaps you might also think hockey pucks, Sorbothane and lead fishing weights are well suited as isolation devices, too. I suspect you might need to investigate the whole mass on a spring concept that's been floating around recently.