It certainly seems to give a better range of brightness than your previous method though (albeit a bit of a jump between the overexposed area and the lightest part of your printed gradient - not sure if there’s any way to improve this, apart from possibly defocussing a bit more?).
It still seems a rather involved process, though, compared to the alternative (shooting a point light source against a wall in a dark room). I think both times I submitted noise profiles it took less than 20 minutes from turning my camera on to submitting the results for inclusion. Does this new method give noticeably better results than that?