I can say that I've never ever been hit with any trial restrictions and I must have done 10 sets of RaFs over the last few years. From what I remember, the moment you accept the invite you're able to input a game key. If you input a game key at that time you will not be restricted as a trial (from all of my experiences). If you wait or log into the account while it's still under trial status then I would assume the system now thinks you're a trial and will treat you as such for as long as it takes to update itself.