RaggedRobbin, such a long post. I hope I can address at least most of the points.
Yes, each situation is different, some offer no problem in the fact that for some love makes everything go smoothly while others simply don't care about their Faith enough to "stick out the rough spots" a mixed marriage will emphasize so their giving up their Faith makes things go smoothly in their eyes. (Sorry, no "judging", I just can't for the life of me understand "giving up the Real Prescence of Jesus".) Still, IMO, it is highly imprudent to "tempt faith" with the idea that "only the good can happen" or the idea of "if worse comes to worse, we can always get married outside the Church first and then force the Church to bless the union that already exists. And so while dating, Catholics and non-Catholics can date, but it doesn't seem too wise (particularly since dating is supposed to allow a person a chance to "pick his future husband/wife).
About that "equally/unequally yoked" thing to mean Catholics and non-Catholics, I've never understood it at all. (Although the way you put it has me I looking at it almost wistfully since I guess it would make things extremely easy.) But,by that my husband and I would never have been able to marry. I didn't want to change my husband-to-be. I was perfectly happy to have him a Baptist. (Afterall, that's part of him and probably what makes him what he is.) I simply wanted to remain Catholic. Anyway I always took that verse about "unequally yoked" to mean marriage of a non-believer and a Christian anyway. (Although if you go to GT or actually speak with many Protestants--as in Baptist, Episcopal, Methodist,... you'll find that they lump Catholics in the non-believer category. I don't know what they do with 1 Corinthians 7:14 which says, "For the unbelieving husband is consecrated through his wife, and the unbelieving wife is consecrated through her husband.")
BTW, I believe that the Church is very magnanimous. The Church allows mixed marriages (marriages of Baptized non-Christians and Catholics) AND those marriages of disparity of cult (marriages of non-Baptized non-Christians and Catholics.) Paragraph 1633 and 1634 of the Catholic Catechism address the problems quite well, and paragraph 1635 of the Catholic Catechism: "According to the law in force in the Latin Church, a mixed marriage needs for liceity the espress permission of ecclesiastical authority. In case of disparity of cult an express dispensation from this impediment is required for the validity of the marriage. This permission or dispensation presupposes that both parties know and do not exclude the essential ends and properties of marriage and the obligations assumed by the Catholic party concerning the Baptism and education of the children in the Catholic Church."
As far as the Eastern rite Catholic/Roman rite Catholic, you have just described my best friend's marriage--Rutherian Byzantine and.... (You do know that both rites make up the ONE Catholic Church and one Faith, unlike the different denominations.) Although she'll go to a Roman rite parish by her, she can also attend the Byzantine Church not too far from here. Although technically Baptized into the Roman rite, I too sometimes attend the Byzantine Divine Liturgy.