Revert Production Viewer to non-existent Development

In case a development application has been deployed to production via the web designer deploy functionality, and then the development application has been accidentily deleted → there is no option to view the production viewer in the designer and no standard way to put the production application back to just a development viewer, let alone a linked development version of the application.

I would like an option where the above is possible.

I have already tried to copy the production application (via AGO assistant) and then altering the Description json from "Geocortex Production Environment" to "Geocortex Development Environment". By copying the item, the original deployment settings are removed, and then the change in typeKeywords will make it visible in the Viewer Designer. However this worked for one viewer and not the other (got stuck in loading), and has not been tested… or is there already a tried and true way to do this?