I've made a decision and i'll order a single metal one with Ed U. I seriously don't want to risk getting locked out because the other breaks on me as well.
The handle on the passenger side broke off because of too much stress. I realigned the latches on that door, but I didn't tighten one of the latch clips. That one came loose and when I tried to open the door I pulled too hard on the handle. Strangely, it didn't break at that moment. Only after I reattached the latch and opened the door at a later moment it came off. I suppose it was already seriously weakened by then.
I'll fix the new one on the driver's side and move the old plastic one to the passenger side.
Another -90 euro from the windscreen/aircon budget which now balances out at a stable minus 1640 euro.