Unfortunately, the developers have confirmed what I had said above. Machinima is now Legacy and will not be updated. A2F is also not currently scheduled for an update at this time, and we are not supporting A2F here on this forum. USD Composer is a development template for you, the developer to customize and shape as you see fit. The latest version is the Kit App Template (KAT) available on GitHub. If this does not work as you would intend, you would have to write your own code or extension to do what you need it to do. In addition, as expressed previously, Omniverse is not intended for Character workflow. That would be the new ACE.
I am sorry I do not have more news on this.