I plan to import a set of RF components for further development. What i am importing is just a PCB with a Bluetooth radio on it. We will be further building on this component, add our firmware, external housing and may be expand the PCB further. What i would like to understand is, if such a component required WPC approval. Fundamentally we are not yet in a position to answer most of the questions in the WPC form since we are still developing the final product. In this case is it required (and possible) to get a WPC ETC / NOC for customs clearance. Our shipment is actually stuck at customs

Does anyone have experience importing electronic / RF components?

Your first line says that you plan on importing.
Your last line says you have already imported and gotten stuck.

What are you developing ?