Line locks don't affect brake bias at all. My dunebuggies use turning brakes to steer when the front wheels are off the ground in a hill climb. They are plumbed inline with the main brakes & have a master cylinder that works each brake separately as I pull the handles. I also use a staging brake plumbed to the fronts as a hill holder with a single handle to activate both fronts simultaneously
. Think of it as a manual line lock instead of a solenoid.
The red handles are left & right rear brakes, the blue is the front brakes & the black is the shifter. The master cylinder still controls the brakes like normal when my foot is on the pedal & nothing interferes with normal stopping.