Since this is a main part to live Google free, I don’t know why I missed this possibility until now. Was it mentioned in the forum before?
For sure it gives me a quite better feeling and confidence to start with my FP2 without a Google account… This made my days during setting up my FP2 
Edit: Now after knowing what it is good for, I realized that the apk-downloader was already mentioned in earlier posts. But I was not aware about its function at this time…
… here, here and here…