Perhaps the easiest mod would be to fit a "left side" fork sheath on the right fork, in order to fit a second caliper (yes, it would be upside down compared to the original caliper)
That way, two OEM discs on two OEM calipers... may look horrible, but only when parked. While riding, nobody stoops down to look at your calipers...
Then all you need is a brake pump off a Bandit and brake lines for siamesed front discs...