I found this little thing https://www.reddit.com/r/arma/comments/2b2cef/creating_custom_zeus_compositions_in_arma_3_x39/

uhm, I have a similar project that installs the compositions directly to the compositions tab once subscribed. I can help you out with this i think.

Check this out http://steamproxy.net/sharedfiles/filedetails/?id=1233323201 I think this is what you want right?

Ok if that is actually what you want I will give you a little discussion thread with instructions on how it works. But you will have to modify the script if you want objects on top of each other or blood stains on the walls etc, because the script i'm giving you will not adjust for height of objects upon spawning the compositions. This is an issue i'm also struggling with on my project as well. Anyway sorry for the long a.s.s text, here's what you are looking for: https://forums.bistudio.com/forums/topic/170649-tutcreating-custom-compositions-for-zeus/

I hope that was useful and I helped you out man, please tell me if you figure out how to make the script account for height and rotation.

Have a good one!

Sorry for the self promotion there btw i just realised. I will remove it once you reply/see it.