Suppose the following situation, which commonly arises. A Jewish guy starts dating a non-Jewish girl, and they both fall in love. She respects his religion and wants to convert in order to be able to marry him under a chuppah. We are talking here about Orthodox Judaism.
Now, she may start out wanting to convert in order to be with someone. But as she goes through the process of learning about Judaism she may genuinely come to accept the Jewish Covenant and decide to follow all the commandments. If she immerses in a Mikveh and a court of three observant Orthodox Jews finds her Giur to be successful, then she is a Jew, right? From that point on, if she keeps all the commandments to the same level as a relatively lax Jew, she is still considered fully Jewish.
I realize there are some Kabbalistic opinions that souls of converts were really Jewish from the moment they were born.
My question is this: rabbis traditionally ignore the first few requests for conversion. But are they expected to totally turn someone away if they begin conversion as a result of being in a relationship, because it is "for the wrong reasons"? What is the most successful way to actually get such a Gentile girl to convert? I am concerned about the following issues:
Rabbis refusing to start the process because the girl is in a romantic relationship with a Jew
The effect on soul of the convert of not following all the commandments post-conversion vs remaining a relatively righteous Noahide
If I were to date gentile girls, and casually tell them about Judaism, and only marry one who becomes genuinely interested of her own volition (placing me in the company of e.g. Steven Spielberg, Jared Kushner and Sasha Baron Cohen) what are the consequences of this in the afterlife, etc. according to rabbinical Judaism?