If you have the original coil why not have the speaker rebuilt?
Or is the coil burned out? That's the most common failure mode.
There's a guy up in Cleveland or Akron at Play Things of Past who has a storehouse full of parts and junque. He may have the right speaker.
http://oldradioparts.com/pg2.htm
jeyurkon, I'm a bit confused about your post - I'm with you to the 3.2 ohm voice coil impedance - but field coils varied from 500 to several thousand ohms impedance. Without knowing what the radio used, substitution of a choke for the original field coil is dicey, isn't it?