When I needed to remove my Darrin steering wheel, I needed to drill and tap two holes and then use a steering wheel puller in the normal fashion. You will need to have the proper special tools to do this because I found the wheel to be very tight and if not done correctly, you might damage the wheel where you drilled the holes. I am a mechanic by trade and already had the proper tools which can be expensive.
The holes need to be drilled in the metal not the material around the metal.
Maybe we could talk about it. My phone number is listed in the bulletin as the Darrin Registry Manager