Even if it is not exactly what you try to achieve, I thought you would be interested in those two projects:
* Towerify: to efficiently manage a fleet of #YunoHost servers (https://github.com/computablefacts/towerify)
* World Wild Welsh: a resilient multi-site infra with YunoHost made by #raoull <3 (https://wiki.raoull.org/resume-technique/reseau-worldwidewelsh)