The only option left is to manually re-create the apps. And in my opinion, it would have been a better option if you would have also used hostpath for the config storage. Because this would allow you to simply re-install the app, point to the existing hostpath for data and config and the app should start up just fine.
Now you have to see how to get the config out of the iXVolume (as mentioned preferably to a hostpath) and then re-create the app.