@TLAS the standard mini thermocouple connector is nearly 17mm wide, so fitting two of them on the thermocouple daughter board would not be feasible.
There are some smaller thermocouple connectors available but I haven't seen any in widespread use. Most thermocouples I see advertised are wire ended, not terminated in a connector.
The Duet3D daughter board works with several different types of thermocouple, not just type K. We have users who extrude very high temperature materials and use other types, and for them including a type K thermocouple connected would be a disadvantage.
So in short, we don't have any plans to do this. The screw terminals seem to work well with any type of thermocouple. If you connect the wires the wrong way round then it is quickly obvious, because the temperature reading goes down when the heater is turned on.
We could do a custom run if sufficient quantity was requested. The minimum quantity that was economical to make would probably be a few hundred. Alternatively you could do your own variant starting from our open source design files.