I would stick with some combination of red dot scope with NVD or infrared. That way, they can’t see the light you’re projecting.
I’ve heard the military uses infrared lasers - not visible to the naked eye. But you’re still stuck with using an infrared optical device to see your dot. And as far as I know, non-visible lasers are not available for civilian use.
They are legal but have been way too expensive. There is now a new IR laser out for civilian use but I do not remember the make or manufacturer.