If the archbishop said that people may stand, sit or kneel after the hymn is completed, that is fine.
If the archbishop said that everyone must remain standing until all have recieved Communion, well… he has no more authority to issue that ‘directive’ than you, I or my neighbor’s pet cat.
We are all on equal footing authority wise in that regard
I don’t know. I would do what the archbishop asked me to do, if it were not immoral, for no other reason than that he asked me to do it. Gratuitous obedience may not be a virtue, but it makes the pastors’ days a little easier, and I’m all for that. I would do the same for my dad, and for the same reason. His authority and my affection for him is such that I need no compulsion to force me do as he asks. If the archbishop directs me for pastoral reasons alone, and not because canon law says he can force me to do it, that is still good enough for me.
I might even do that for you, although probably out of charity rather than out of respect for authority and affection for the priesthood. As much as I like animals, I’m not so sure I’d say that about the cat. It depends on what he wanted.
What difference to other people would it make whether you do your
Anima Christi standing, or kneeling?
Or are you just supposed to stand there and gaze into space, while everyone else is receiving?
It doesn’t make any difference at all, if there isn’t singing. If there is singing, though, I sing, for “to sing is to pray twice”. Probably more to the point, I spent enough time with my aunt while she played the organ to know that group worship is rendered more than a little pathetic when no one sings. Some people can’t carry a tune in a bucket, though. I don’t blame them for choosing not to contribute.
As I said, I have another way of looking at all this. You have your pious reasons for wanting to kneel immediately and I have my pious reasons for being perfectly content to remain standing.
OTOH, I’m not the rubrics police. If I go to a parish in our diocese where everyone sits or kneels after Holy Communion, instead of standing, then I do that. Mass is a communal celebration. Except for something truly important, like kneeling during the consecration, I would rather do whatever seems most like we’re all praying together.