Okay, that is as I understand it as well. That the person taking part in holy communion with the Lord need know exactly what that most holy sacrament really is and what it is that they are actually doing by participating in it. That understanding is what is necessary (as well as baptism and reconciliation/confession, of course).
While it is certainly not my place to judge anyone taking part in holy communion, it is my understanding that a great many of those who do take part actually do not understand what they are truly doing; not believing in the real presence, consuming the body and blood of Christ in a state of mortal sin when they know that to do so is wrong, etc… and are actually eating/drinking judgment upon themselves. Many of these people have been “Catholic” all their lives yet have such little regard for the body and blood of our Lord.
I agree that everyone should be confirmed, Catholics and converts alike. Confirmation is a sacrament of the Holy Catholic Church, like a personal Pentecost, and I very much look forward to my confirmation and would never give it up. It is so very important, and is based in the teachings of our Lord, Jesus Christ.
But technically, as I understand it, by having a very sufficient understanding and belief in the Eucharist, and greater understanding of it than even many Catholics, then I think that it would not be necessarily inappropriate (nor sinful) for me to confess my sins to a priest and then participate in holy communion, even before my own confirmation. I will not do so, of course, because I have made a promise not to, but it is true - all other conditions being met - that understanding (and of course believing in) the sacrament is what is really important in order to participate in it. And such understanding is what so many Catholics and catechumens/candidates/converts lack, unfortunately.