I'm not a fan of Braking with a top mount interruptor levers, alone,
due to the potential of breaking off the cable end.
they are bending the cable, the end of which will fatigue where the Zn ends were fused on.
brake levers made to go on the cable ends always pull straight ,
or at least let a barrel end freely rotate to pull straight.
get that HMO insurance policy in effect.