You can emulate an I2C EEPROM to fool the Fluke. By bit bang the GPIO lines on the ESP, you can make a read only I2C slave EEPROM device assuming that it can boot up fast enough to do so.

Update: Fluke issued a statement on its Facebook page on Thursday to address SparkFun's multimeter issue, saying, in part: Like any organization that designs and manufactures electronics, we ...