We are still seeing issues related to questionable temperature readings from the cartridge style thermistors. These parts are currently soldered, but this is a labor-intensive and manual process, sometimes the solder will not flow into the terminal, and is not recommended by the manufacturer of the terminals. Part of the issues could be related to the fact that the connector is not mounted and susceptible to degradation due to vibrations.
An idea I had would be to make a tiny PCB with pads on one side and a connector on the other and one or two mounting holes. Then make the stencil so it puts paste on the pads and after reflow you would have a nice tinned pad that you could touch the thermistor lead to and the tip of an iron to and quickly get a good joint without having to add any solder. Depending on how big the board is and the weight of the copper we could make this tiny PCB to handle the heater circuit too. Small PCBs like this are easy to manufacture in panels with v-scores. The mounting holes would minimize flexing and vibrations on the connections which would be good.