Which Small Sun are you using? The ZY-C10 Aspheric thrower? I dont' have any experience with changing the angle of mounted lights. Is it secured with one ring or two? If two, maybe you could place some offset shims to change the angle slightly. I don't think it would take much...
I don’t think such a creature exists. All optics have internal adjustments so any mounts for them are fixed, really for durability. Honestly the only thing I can think of is buying a cheap aimpoint clone, gutting it, and fixing the flashlight in the tube of the optic so that the windage/elevation adjustments work on the torch.
You might be better off just increasing power and flood. You could also try shimming the light in the mount (I mean strips of paper or aluminum foil.)
There are scope rings with built in moa ideal for long rang shooting with a scope that has less adjustment or with adjustment shims
So my suggestion would be to shim it also
I think that’s your answer right there. You don’t need mil-spec accuracy; you only need your light to aim down slightly. Assuming that your talking a max of a couple of hundred yards, your MOA adjustment shouldn’t need to be too much for varmint/coyote hunting. Should be a pretty simple fix.