Foxmoth,
At the risk of being pedantic once more I did not comment upon whether a pilot should speak to the MATZ controlling authority when near R313, though my personal opinion is that it is well to do so, even if not absolutely forced by regulation so to do.
My post was intended to emphasize the practical point that not all MATZes are identical in their regulatory requirements.
As always, pedantry aside, I am very willing to defer to those who possess that superfluity of experience and knowledge to enable them to express valid opinions as the practicality of the various options for managing a flight in these areas. It is from such debates that I am enabled to learn.