By the way there is a significant amount of IFR flying conducted outside of CAS in this part of the word. I'd guess at least some part of about 70 - 80 % of my IFR flights has been outside of CAS.
??? In one place you say
Flying away from published tracks (random routing) outside of controlled airspace is strictly forbidden here below FL150
- which to me is CAS or much the same, then you say you fly outside CAS, which is it???
In Paces example there is no airway and no CAS, in the UK we can fly IFR on any routing we choose if outside CAS.