Nice work Ray and very interesting information, thanks.
One tiny quibble though, instead of "go nova" I'd put in "experience nova-like eruptions" because of all the things this system might be, a recurrent nova is not one. Papers I've read indicate that R Aqr's nova-like eruptions don't behave as predicted by either accretion or thermonuclear-powered models and it has been suggested that the hot component brightens when the Mira companion loses mass during a helium shell flash. I'm also happy to admit that my information might be out-of-date!
Cheers -