I actually don't have a furnace diffuser in the basement, just a duct running through it. When I cut one in the bathroom I may consider adding an adjustable diffuser for the basement area.
I can't emphasise enough you have to be careful putting any electric heater in a concealed space that has potential for having stuff fall against it or with insufficient clearance. Most have tipover protection but something falling against it will restrict airflow and cause an overheat. Even a 1200 Watt electric coil heater will generate enough heat to ignite canvas, nylon fabric, cardboard or even the heaters plastic housing if the airflow is restricted. Be careful where you put it!
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