Can I switch my Bosch camera managed by a VRM to record to the SD card without factory defaults?
If you remove the camera from the VRM pool, the camera will not be managed by VRM anymore and you can then configure SD card recording on it.
For example, if you use BVMS, you can simply remove the camera from the VRM pool and add it afterwards as Local Storage. Local Storage can be found in the Devices tab, towards the end of the Devices Tree. You can right click on it and then scan for encoders to add the camera more easily.
This will not require any factory default.