According to Memory Alpha we know of 15 Klingon planets, not counting Qo'Nos or Praxis.
The same site lists 3 Romulan planets, not counting Romulus and Remus.
Seeing as XI tells us that there's less than 10,000 Vulcans left out of 6 billion. It would appear that, for whatever reason, Vulcans (and Romulans) don't tend to colonize planets in large numbers.
I wonder how the whole "supernova" will be handled in the novels. If it were me I'd mention Romulus and Remus being destroyed and leave it at that. Why open a can of worms that big?