Now that's a really good wheeze, except that it sounds a tiency wiency bit like, well, I hesitate to say, but the f word
fraud.
Just my opinion.
I do suggest quite strongly that you take advice before doing this. If you register for VAT, do the right thing but it proves to be unacceptable, that's one thing, but to setout to systematically defraud c&e, expext to go to prison!