In the past we had created an importer for BP Albums because of vocal demands from users. However, it took up a lot of development resources that could have gone into improving our plugin faster.
It is really unfortunate that BP activity plus is coded in such a manner. Even if we build some sort of an importer, all these shortcodes will have to be found in the database, replaced with static content (like BuddyPress devs recommend) and integrated with the new rtMedia.
Now, this is something that we’d rather do after we are done working on the core features. So, unless someone sponsors this, it is a distant plan. I’m aware of other users who are interested in this too. Maybe all such users in need of legacy support for BP activity plus could do so in a group.