Is there a dual resevoir disc brake master cylinder that will hook up in a 61?

[61Chevy454]

Hey guys, so I have a 61 K20. It has GM 10 bolt axles front and rear, the fronts have discs, the rears have drums. Now I'm kind of sketched out by the single reservoir master cylinder in it, as if I lose a wheel cylinder, none of my brakes will work at all. I'm pondering in the future, possibly putting in power brakes with a booster from Captain Fab, and swapping discs in the back. I figure it would also be a good time to change the master cylinder to something more modern. Do any of you have any idea of what might fit in terms of dual reservoir disc brake master cylinders?