how can I strip the surface from an iron alloy pan without harming the metal?
There is a video at the manufacturer's web site.  

My French is strictly limited, but it is pretty self explanatory even if you cannot read the captions.  Just be prepared for some really cheesy music.

It appears you were supposed to wash off the beeswax (which is probably just to keep it from rusting during shipping and storage) and then season it much like any cast iron pan (although this is a die-pressed iron pan, and should be smoother).

The following advise is specifically in response to the original question asking how to remove the seasoning so that it can be re-seasoned as the OP desires.   The general advise against using detergent or soap on a cast iron or pressed iron pan is to protect the seasoning on the pan, not the metal itself:

Now that you have a wierd amalgamated coating, I would wash it with something strong--like dishwasher detergent or Barkeeper's Friend--then when you are back down to the metal, season it as desired.