Hm... it is to power up a 240v shaded pole motor at hald the voltage (120v, draws 8W there)You are asking about 50/60 Hz CFL ballast chokes? They act as constant current source and can work for you if the load has at least proportional (resistive) V/I characteristic or a stiffer characteristic towards constant V.
The motor nominal voltage is 240v. So can i connect the primary of a small transformer in series with the motor, to use this as a choke? The primary has some resistance so this might work?Series diode feeds DC to the induction motor and fastly burn the winding. Don't!
I guess a 4W CFL choke can work. A variac or rheostat would allow to adjust the intended voltage.