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Another option might be to not stack the TC4 on to the Arduino.

The I2C header (4 pins, labeled I2C) on the TC4 will provide access to the temperature sensing system and the EEPROM on the shield. You would lose the functions of OT1, OT2, I/O2 and I/O3 since those ports rely on the connections made through the stacking header. But if you are only using the TC4 as a temperature reading device that should not be a problem.

So you might want to try making a 4-wire cable that carries Vcc, GND, SDA, and SCL and connect it to the TC4. Be sure and consult the TC4 schematic to get the signals in the correct positions on the 4-pin header.

Jim