Scud I operated into all those places you mentioned (and more) for about 12yrs but can't remember being cleared to an altitude from a cruise level. (note I am talking about jet cruise levels)
A clearance would normally be to a low intermediate flight level (say Fl120) followed at a later stage with a clearance down to an altitude, the latter is when QNH was set. Never had problems with busting altitudes with this procedure.
Now if you are really keen, your airlines NAV department may well have the AIPs for the places you go to!!!
