I personally think the canons are silly. I was raised Lutheran before becoming Roman Catholic and canonically transferring to the East. Swedish Lutherans are not Roman Catholics - we have our own identity and ethnic heritage which we are very proud of, and which is not the Irish-German heritage of the Roman Catholic Church in America.
That being said, most people have their heads on straight, and pastors of Eastern Catholic parishes usually have arrangements with the local Roman Catholic bishops to receive baptized converts from secularism or Protestantism directly, handling the canonical paperwork themselves. The Roman Catholic bishop is usually going to just be happy that someone is becoming Catholic without caring which rite he comes into - the Eastern Rites are smaller and a part of the patrimony of the Church they have just as much interest as we do in preserving, and they almost never object to one of their own flock transferring, much less a Protestant who has never been to a Roman Catholic Mass in the first place.
***It is important to rectify and clarify one’s canonical situation, because it determines what fasting discipline you are bound to. You may have never been to a Roman Catholic Mass in your life, but if you are canonically Roman you are bound to Roman discipline - meaning that you do not fill your Sunday obligation by going to Vespers the night before, and if you eat two full meals on Ash Wednesday, regardless of whether you avoided wine and non-vegan food, you have broken the fast. Likewise, if you are canonically Byzantine but practicing Roman, you are still bound to much higher fasting standards and many more Holy Days of Obligation than you are probably actually practicing.
If someone becomes an Eastern Catholic directly, he does not go to RCIA - typically he simply talks to the priest. At my parish which received three converts from Protestantism Pascha before last, many of these educational talks were given by the priest over brunch after Liturgy which the whole parish (fewer than 20 members) usually attended together.