It seems to me that the SCE could have done something similar for the Romulan worlds. The Core worlds are goners, obviously, since the star goes supernova, but for nearly worlds, within about 100 light-years and at risk of sterilization from the wavefront, the SCE could build giant planetary shields, thousands of emiters flying in tandem that would be oriented between the inhabited world and the Romulan supernova, to create a shield that would take the radiation.
I posited in Mere Anarchy that something very much like that was being done to shield worlds from the one-two punch of the Minara and Beta Niobe supernovae occurring within a few months of each other. (Man, Trek really overuses supernovae as a plot device.)