How do I create MOGRTs where the time between the intro and outro animations can be extended?

Hello,

I have created a set of sport based broadcast assets in After Effects that animate in and animate out. I am looking to create some mogrts of these for other members in the team to use in Premier Pro. These include fixture listings and tables which can vary quite dramatically in the amount of content which means they need to vary in length. 

I am looking to create MOGRT's where they can change the length of the assets and the outro animation moves to the end. i.e. If the MOGRT is 7secs and the outro animation happens at 6-7secs when this is extended to be 20secs the outro animation moves to happen at 19-20secs. I tried to use protected regions and though you can extend the length of the mogrt and the animations are preserved, the animated outro doesn't move to the end. In essence I want the time between the animations to be variable.

Happy to share content and more information, all my apps are up to date, any help is appricated.