Workflow solution for multiple aspect ratio deliverables: horizontal, square, vertical?

Hi all,

I constantly need to deliver videos in multiple aspect ratios for social (16:9, 9:16, 1:1) and haven't found an easy way to translate my edit to each ratio/resolution while retaining the keyframing I've done. I usually finalize my edit in the native aspect ratio, then duplicate the sequence and set it to another size. However, this makes all of my resizing, positioning, and text/title layers irrelevant. I have to go through each shot and recreate the keyframes, etc. Is there an easier way to duplicate a sequence while somehow retaining/scaling this info? It would dramatically speed up my workflow!

-D