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Gray ive not had a close look at one but does the cup fan have a resistor pack on it/in it?
This is how blowers normaly work.
The interior fan switch supplies 4 different lives depending on what position the switch is in. These are wired to different parts of the resistor depending on the speed required.
On mine I found all the original lives at the plug. I didnt wire any of them up coz im only running it on one speed (For now, think that is a mistake tbh) I just found the wire that is live when the switch is in position 4 and wired it straigt to the motor (other side is just a simple earth)
Following this principle you can find out what wires are what speed and wire to the resistor.
If it doesnt have a resistor then you could get one off and old ford escort/.transit or similar. Very easy to wire up, just spade terminals. Only gives 3 speeds not 4 but thats what i will be using when the time comes