ummm well now this im not quite sure... Also I forgot to mention if u havent flown since past 1 year, your class 2 would still be valid..
Else, I am not really sure if they issue a NOC for class 2, though they do issue it for class 1.. I feel the best opinion would be your Class 2 doc himself as he would know all the rules related to this in more detail.. My class 2 doc only had advised me of such rules...