> Should these three time-travel back to the days of WWII, and join the JSA? Would that be a good way to be able to bring a few Golden Age tales back into canon in the DCU?
NO! We don't need to make their histories even more convoluted than it is now. How would we explain when Superman and Batman first appeared, that everyone thinks they were the grandsons of some guys who were around in the 40's?
It doesn't make sense in Hippolyte's case either.
Personally, I still consider Batman, Superman and Wonder Woman apart of the JSA history. Maybe one day the writers of the DCU will fix this mess they did when they plucked them from existence and messed up the whole DCU.