Vibration isolation is a tricky thing. It all depends in what you want to accomplish. It's not the same trying to absorb and drain the vibration generated at a device to have it vibrating less, than to isolate a device from the environment, condemning it to keep its own vibrations into it.
For turntables I prefer a mixed thing. To drain the vibrations produced by the motor and the own platter spinning, I like high mass TTs with external separated motor, placed on a surface which can take both devices vibrations but it's isolated from the environment by some rubber, sorbotane or the like.
On a 1210 the first goal is difficult to achieve for being direct drive, however spiking the table on a high mass surface, could help to drain the table's vibration somewhat, then isolating that platform from the environment using absorbing feet, rubber or whatever alike, could help. Hence your idea could work quite well.