The currents would be much less than 4mA. I’ll try to estimate the most current we could expect. Some googling throws up that a human body has ~30pF of capacit

The currents would be much less than 4mA. I’ll try to estimate the most current we could expect. Some googling throws up that a human body has ~30pF of capacitance, and that static electricity can be up to 20kV in very dry conditions. That’s 600 nanocoulombs of charge. If we guess that you’re building that up once once every minute (what a terrible existence, getting a big shock 60 times an hour!), then the grounding strap would be carrying ~10nA continuously.