Changing the root URL of a Cordova app

With Xervo / Modulus shutting I’m moving my hosting elsewhere. The trouble is I’ve been using the free domains, and those URLs are embedded in Cordova apps.
Is it possible to redeploy the app to Xervo while it’s still here, and point to and updated host URL (which I would have deployed to aswell) and essentially switch hosts?
My apps are mainly used for theatre / media art, they’re not in the app stores. They’ll only ever be installed on the devices that they’re already installed on.