It also appears to me that the most you can get towards 480v is from the 100% taps. On the other hand equipment tend to have an operating range of +10 to -30% of the stated voltage. Mind you that operating in these ranges may shorten the equipments life. You may be able to verify this range with the manufacturer.
As far as the emergency stop, the ones I am familiar with would not care about the voltage for this portion of the circuit. They are a one time deal firing a cartridge into the blade, they have to be factory rebuilt afterwords. Costly but far less so than even the loss of one finger. Again verifying with the designer would be smart.
When said and done, it is better just to do it right.
