Nope. The CAA clocked people doing that a while ago and sent a cease and desist message out.
I have to say I agree with portsharbourflyer. the lifting of the restriction to me means very little in terms of instructional ability. I have seen an awful lot of FI(R)'s getting the restriction lifted in a matter of weeks. They are no better than they were to start with really, but they met the requirements and away they went.
It took me a year of full time instructing to do it the "proper" way and by that time I was a very different FI than I was at the start.
An upgrade test maybe a god idea, but I wouldn't want to suggest that we make the system any more complex or expensive than it already is.