I've just re read this oople report which dealt with a similar Schumacher tyre that had just been released but as it was deemed not to be easily available from model shops (I.e not commercially available) -Paul worsley and the committee decreed they couldn't be used. I wouldn't class them as easily available from Schumacher where tomorrow is Friday and no guarantee you will get them before Saturday/Sunday
So far I haven't found any in stock at the 2 shops I use which I know have a good turnover of tyres so it might require a clarification from your rep before you use them
http://www.oople.com/rc/photos/2011national-rhr/