For a commuter bike, the much rarer DRUM BRAKE makes more sense.
Take your existing caliper bike and have the front wheel rebuilt with a Sturmey Archer XFD drum brake or XFDD dynohub/drum brake.
Assuming your existing rim is a 36 hole, should be an easy swap, with near disc braking performance, brake pads that last nearly forever, are less affected by wet weather than a disc, and allow for stronger, dishless wheels, while working with your existing non-disc fork.