This reminds me of the 1st electronics company I worked at. We didn't have any ESD equipment, so I built a circuit which took power from a wall socket and pumped the voltage up to 2kV using diodes and caps, and sent that through a simple human body mode resistor/cap (https://en.wikipedia.org/wiki/Human-body_model) to do ESD testing. It worked well enough for the simple testing that we did, and was successful at finding weaknesses of our PCB layout for static protection.