The guidance for examiners is the FEH not SD19 which is labeled guidance for candidates.
The Test is meant to be a practical flight; simulating bad weather after you have diverted may be a little impractical. By simulating bad weather somewhere on the second leg (usually after 10 - 15 minutes) you can introduce the turn in a sensible sequence, get the candidate to a position where getting a radio fix is relevant, then simulate worsening weather leading to a diversion. Any tracking will depend upon the route and location of aids. That is what was briefed by DHH at the various JAA seminars some years ago and is consistent with the current FEH.
I think in the absence of any suitable controlled airspace a MATZ makes a reasonable substitute, if you can find one!