This might possibly intersect with Using a camera app other than the default one in Android 11+.
We are working on making it possible to specify which application to use to capture an image. If any of those applications respond to the ACTION_IMAGE_CAPTURE intent, they could be used to get an image back. I don't know how likely that is, but it might be worth looking into.
If there's an app you like that's almost there, I think it's worth contacting the developers, even if it's a big company like Bosch. It may be very little effort for them to enable this whole new interaction that they'd be happy to support (e.g. by exporting to the Downloads directory, by responding to ACTION_IMAGE_CAPTURE, by implementing the ODK-specific spec for returning values).