That would be pretty cool, but I don't know that it would be possible. Comparing keys from the IBM to the one Cherry MX board I currently have (a kinesis), while the tops are the same size, the IBM keys are longer, from front to back. Plus, the cherry keyboards use different profiles on different rows, while the IBM does not. For instance, the QWERTY row keys are MUCH shorter than the number row keys, which are themselves a bit lower than IBM key caps.
But it would still be cool.