Thanks for the suggestions, I'll try to find one GFI as soon as I figure out how it's called in German.
I agree with the naysayers, there will always be a way to kill yourself no matter how many precautions you take. The thing is, I'm not the only one using the workbench, I have a few less technical (electrical) inclined friends that come sometimes and use it as well. Might as well make things better for everybody if there is a way.
It's a hobby, not my job, I did not have safety courses for this, just common sense. Also, I've got shocked at least 100 times (220V), starting at age 5, when I was using the apartment building three-phase power distributor as a xylophone. Time really seemed to stand still for a few seconds
Oh, another thing regarding venting about safety issues: you should watch PhotonVids on youtube, it really kicks the whole thing up a notch: high voltage, high current, alcohol, fire, xrays and a bunch of other stuff all at once. I haven't managed to trip the neighborhood's safety switch, yet.