If you had a big collection of neutrons, they could decay into protons, electrons, and neutrinos through beta decay since protons are the only stable baryons. After a while, you should get hydrogen out of that.
Assuming some process to account for baryogenisis, this would mean that the universe could start with a whole bunch of neutral baryons and generate electrons as needed without having to worry about pair production to get its leptons.
With this in mind, is there any evidence that hadrons were created first and then, in turn, created leptons (regardless of evidence for baryogenisis itself)? Or does the current theory suggest that leptons and hadrons were created contemporaneously in the very early universe?
