My understanding is the first is wrong, there should be no announcements before or after a homily in either Rite.
For the second, I believe it’s OK to have the announcements as you describe, but distinctly separate from the post-Communion period, so there is one extra sitting and standing, in other words, announcements just before the final blessing...?
That’s what our priest does. So I think it’s OK.
Announcements either just before or just after the homily have been made in the Old Rite since my earliest memories—which would be in the mid-1950’s.
No problem. Not illicit by ANY means.
That is how it is in our parish, it used to be before the Mass began but I guess the latecomers were missing the announcements.