Not worth doing until someone pays for all the type approval - which at in excess of £4k is going to put most people off from doing it. You need to find a dealer willing to make the jump, who can then make the money back by charging an amount to all the other people who then want the relevant paperwork. The trouble is, that unless you get firm orders, you won;t know how much to charge to recoup your money, hence why there seems to be a sticking point at the moment....