The winner is creativity and truth. The creativity is in the perfection. The truth is in the copying. Do your client's aspirations match this.
LifeinAsia says what , why , when , how , who , which i think is a good start for questioning.
Where has the idea been seen before ( pure innovation doesn't exist -it is all out there in some shape or form , even if it is components ) - all you have to do is show how you will do it better. Ask the client where have they have seen it .
I think the Japanese invented the process in more recent history for the rest of Asia to indeed copy, although through the ages everyone's been doing it.
Look , immitate and perfect. Can you immitate and take it to the next step ? If not just say so.