You should be able to cut out the temperature monitoring code fairly easily. But really... You might be better off just connecting up a thermistor and heating element and tying them together so Marlin thinks it is in control of things like it expects. Later, if you get your printer working correctly and doing what you want, you can do a cost reduction phase and get rid of the extra $1.00 worth of components and wiring.
The big problem is thermal stuff is every where in Marlin. Even if you were highly skilled at embedded firmware, it would be easy to make a mistake and screw things up. It would be much safer and much quicker to just give Marlin a thermistor to monitor along with a heater to make it think it is in control.
The big problem is thermal stuff is every where in Marlin. Even if you were highly skilled at embedded firmware, it would be easy to make a mistake and screw things up. It would be much safer and much quicker to just give Marlin a thermistor to monitor along with a heater to make it think it is in control.