I know that sufficiently energetic protons and photons (1.7MeV) can knock a neutron out of a beryllium nucleus. Can an electron do the same?
Agreed. Back in the days Van De Grafs were used, millions of volts were routinely developed. Then again, they were pressed into using high pressure containment to mitigate arcing. It does beg the question, what is a reasonable voltage for commercial use?