I do not understand your point. Beatrice and Eugenie were born HRH Princesses. It is not a gift depending on how hard or even if you work for the Firm. Perhaps you could discuss it over at the "Questions about British Styles and Titles" as recommended earlier by Zonk.
As to "Charles" making their position clear to their father, his brother "Andrew"? I would dearly love to know what the name of the fly on the wall was!
However, last I heard, HM Queen Elizabeth was still the monarch and decisions about the BRF are hers to make. That renders all these alleged conversations utterly void and nothing but stirring by the media hoping to provoke a response.