That's what I was thinking too, you'd need master cylinders without integral resivoirs. It's possible, but I don't think it's really practical on the CB.
You don't. The m/c's and reservoirs are an integrated unit. Needs both clutch and brake m/c's of the type that require a separate reservoir. Quite expensive, no benefit at all. Also must be very careful to get the piston sizing and lever ratios correct or clutch/brake action could be very wrong, and perhaps dangerous.