There's a trick that round track racers use that might be worth considering. Use two master cylinders applied by one pedal, with a pivoting link connecting them. Front and rear brakes are totally separate- - - -they don't share any components, even metal and flex lines. If necessary, different diameter master cylinder bores can be used to apply wheel cylinders (or calipers) that displace different volumes.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!