Not sure of the legalities, but if the body of a 1984 Toyota Land Cruiser FJ40 pickup can be swapped with a BJ4O extended body SUV style people carrier, I see no reason why a 90s doule cab to Surfconversion should land anyone into trouble.TLC40 body jugglaries are common place on the streets of Pakistan.
Obviously, I am probably completely wrong and the Pakistan legal system will find a way to completely screw this over.