You say there are not numerous roads and then you argue that the method of travel is just as important as the destination. This is correct, there ARE numerous roads as long as the destination - in this case that there be a halachic method in the conversion process. But of course there are different ways of halacha as well. The line from Moshe Babeinu to the present can remain and be preserved and there are more than one way to do this. Israel needs to be the example to all the Jews in the world. By excluding most of them as "illegitimate" the Rabbinate and the big chief Rabbi insults them and says to them, "you are not part of the family" which they are.
NATO backs Turkey's fight against ISIS (Reuters)
from the article: Zionist rabbis agree to serve on independent conversion courts