CEHBRFN, There is a Snap Camera application.
It has the ability to directly use cam2 api.
When it is activated in the camera tab, the menu becomes available: "weak mode", "zones with reduced ...", "auto mode with ...".
So the activation of these items gives an excellent picture without noise.
The camera takes up to 32 shots, sticking them together.
So here we have max ISO in this application about 1000 units.
I think it would be possible to safely and 6000 expose without shumodava and it would be quite suitable shots.