As simong said, and as I understand it, you cannot use mixed wires in TC mode.
You might be able to use TC on a clapton that is SS316L wrapped on SS316L, however.
Some claptions are SS wrapped in ni80 (nichrome) and both SS and nichrome are suitable for vaping in wattage mode, whereas ni200 should NEVER be vaped in wattage mode as it can give off toxic fumes if it overheats.
You cannot wrap ni200 around SS316L for usage in TC mode, as they both have very different TCR profiles so temp control won't work properly.