I decided it was a fool's errand, quisling. I can get 11 in my 'mini' with ease, and a few more at a pinch... not ideal when you consider the technology.
For the orphan RA, I just about managed to reverse ARC (sharing the 'c' with another member) but it's just too messy - and far from uniform.
Still, it should be possible (with the sheer number of candidates and the highly irregular grid) so, maybe there's another way?