I was too - you really just have to dive into it - I can help you configure the FW for a thermocouple - it’s actually very simple and you always have your back up stock FW to fall back on.
You need to get the E3D amplifier board and wire it to 5v+ and ground on the controller board - this thing here:
Then in the FW you just change the pin number for the temp 0 (extruder) to the pin you’ve plugged the analog output from the TC board to and the temp pull-up table for a k-type thermocouple - I’ll walk you through it… literally takes 1 minute to edit the FW for this and you’ll never have to worry about a sensor failure - you can beat a thermocouple with a hammer and it will still work.
The other issue with thermistors is that they are dependent on the input voltage being perfectly correct which of course can vary slightly depending on how well the voltage is controlled on the controller board etc etc.
I can make you a k type thermocouple and test it to verify that it’s perfect if you don’t know how to make them. The problem with buying one is that the leads are often too short and you need to have K type TC alloy wire going all the way to the amplifier board unless you want to get into gold contacts - basically you don’t want any TC to non TC crimp or solder connections between the actual TC and the board - it can throw off the temp values although in practice and from my testing it’s negligible.