The reccomended practice is to be patient. 

Themes can be exported and migrated however you like. 

But all the new model services items are currently being stored as custom permissions - which don’t allow easy packaging and movement.  We have a pending story to provide migration mechanisms for these items,  but as of today the only solution is to recreate the settings in your new orgs.  

Thanks for the insight Rob, looking forward to what lies ahead along these lines!