"Charge can never be a wave"
Just another cognitive bias...
Please explain your point if you have one. Nobody is interested in statements that have no solid basis.
Proca equation has a very clear and simple interpretation: The electron is a current ring generated by a charge moving at speed of light and is associated to a magnetic flux h/e. Is this motion that is at the very origin of its mass:
m = ħω/c2 = eA/c