Yes, some of what you suggest would be great, and I'll be looking out for the opportunity for those in any new property.  I've explicitly taken a note of the overhang idea!

At the moment I have the problem that my roof surfaces face east and west and that if I depart from my roof line and/or use the vertical surfaces I'll get into planning and covenant problems.

So I'm after inherently safe system against overheating, if possible.

Rgds