So by Native-mode vs. Integrated Mode you are actually refering to Reporting Services.
I assume you also know that one major implication/difference between the 2 modes is the fact that by example, the reports definition files and Data Sources are stored in the SharePoint Content database. Also, there is no concept of “Report Manager” in SharePoint Integrated mode since it is deployed to the SharePoint Reports Library. Security trimming for reports is handled using standard SharePoint permissions.
In SharePoint Integrated mode, when a user makes a request for a particular report, the Report Server Proxy Endpoint will take care of the report processing from SharePoint along with Report Services to return the rendered result.
Read more if interested here http://www.optimusbi.com/2012/11/23/ssrs-integrated-vs-native-mode/
So to conclude, to my knowledge there is no such thing as easy command, in neither technologies (SSRS nor SharePoint) - and that is mainly due to implications such as those mentioned above.
You would need to consider backup of databases, unistalling and re-installing (or if you can afford create anothe installation, on another SQL server and repoint to it after restore) the SSRS extensions and deploying all reports currently stored in SharePoint, back to the database - AT LEAST!