Seemed to work relatively well in grimms vlog.
Its also not that the tcr is non existent. You just need very accurate readings.
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Key word 'virtually' nonexistent.
The issue being that, given current 510/wiring/chip technology (as a whole), that level of accuracy is essentially impossible.
Current TC systems are extremely dependent on VERY solid connections, and EXTREMELY low resistance/variations of resistance within those connections/wiring, and that's before we even get to the topper.
If a slightly dirty (re: juice/contaminants) 510 can cause a variation of resistance upwards of .02-04 ohms, the level of accuracy required to properly read the changes in the resistance of kanthal is unlikely to ever be achieved, at least not with consistent results.
Given the insane number of decimal points of resistance that current boards are able to read, im not saying it's impossible, but it's improbable unless you have a 100% hard wired system, including the topper. Which we all know isn't practical.