How increase ESD protection on thermocouple inpup MAX31856?

maxim make new SPI ADC for thermocouple MAX31856 and this IC have on thermocouple input with ESD protoction on 2kV.
I need increase this protection on 30kV.
My idea is add on input Double ESD protection diodes **broken link removed** 5V , reverse leakage current 50-300nA.

It's good idea?

Looks promising. You'll want current limiting resistors between external protection and ADC to assure that the energy is mostly absorbed by the external diodes.

Thermocouple inputs will be pretty fussy about things
like metal-metal junctions in series. In shunt, maybe
not so bad to add clamps. But you need to know the
real ESD threat model (which may or may not be solely
HBM style) because shunt clamps may fail to protect
against threats with lower source impedance. You may
need to impose a series input resistance that you "own"
and then are you adding the kind of errors on the
thermocouple path, that will kill accuracy / repeatability?

And why is 2kV ESD protection inadequate? Because
somebody said so? 30kV is crazy high, and maybe is
from some high-Z source (because getting 30kV on
a low impedance, would mean somebody burning a
lot of power somewhere) that when shunted by the
existing on-chip ESD, is just fine. Ask "whoever" for
a design-to threat model for this 30kV, do not assume
(or let them assume) it's properly modeled as HBM.

>"You'll want current limiting resistors "
Yes but..
1. Series resitance and the differential resistence inserts error voltage, see page 28 DS Effect of Series Resistance
2, Series resisror insert thermal resistence between terminal (real could juncion end) and MAX IC with temperature sensor for calculating cold-junction compensation.
The ideal would be to have pure copper and short distance
IC have on T+,T- and BIAS voltage protection 45V and 20mA I thing on this input is internal resistor 2250 Ohm.
I know speculation.

>And why is 2kV ESD protection inadequate?
Experience.Two thermocouples operator adheres to the measured object
Occasionally during the operation discharged into the thermocouple and sometimes it destroys inputs. MAX31855 also had 2kV ESD.