Proposals almost certainly count as those situations.
Except that you’re missing one important part — intent.
The chosson knows that he’s going to do an actual kiddushin later by the chuppah and that he doesn’t mean for this to be a kiddushin.
The kallah knows that she’s going to receive a ring for kiddushin under the chuppah and that this isn’t an actual kiddushin.
The people viewing the event know that there will be an actual kiddushin under the chuppah and that the engagement ring is not being given l’shem kiddushin.
Since everyone involved knows that this is not an actual kiddushin, it seems fairly clear that giving an engagement ring (as is commonly done these days) is not an actuall ma’aseh kiddushin.
The Wolf