Is an isolation platform a solution looking for a problem?
I'm not sure it isn't a solution creating a problem.
As long as the scanner is in good condition, the scanning platform, the scanner camera, the negative-- they're all relatively fixed to one another, and the table will dampen by nature, any mild vibrations. There are no ultra-sensitive "floating" components in the chain (like, say, a well balanced tonearm).
I suppose if you're using some form of document imaging system where the scanner is separated from the negative by a large distance and a relatively lightweight support, there's the possibility for vibration-- but even so, I would think an isolation platform, by nature, would be more likely to
induce excess vibration / oscillation.
This sounds like an unnecessary complication that offers imperceptible return on excessive investment. It's like telling me that monster cables carry a "cleaner" digital signal-- even if a difference could be proven, you're still operating so far outside the requirements of the signal that it's meaningless.