I'm in the early stages of research for a potential timeline and found out that Princesse Helene d'Orleans was the leading candidate as Nicholas II's wife. Now, iotl he ignored his parents' preference and married Alix of Hesse. The future Empress Alexandra Feodorovna.
My understanding is that Nicholas had to ask his wife twice to marry him and, his parents' choice had the eye of a British prince. Noting the above, are there any other suitable candidates for marriage?