The K1200/1300 series bikes have a CANBus system - which basically means the bike has an onboard computer network which connects sensors and switches to a central computer module, rather than a plain 'loom' like old bikes. So - each sensor or switch doesn't just send a 'yes/no' (on or off) signal, it can send a range of values to the computer (depending on what it's doing).
So - there's no brake light switch from the front lever or the front hoses because the computer tells the brake light to go on when the brakes are activated - NOT a switch. (the switch tells the computer to use the brakes, the computer then does all the things that need to be done - activate the brake servo, keep an eye on the sensor values from the ABS ring on the front wheel, turn on the brake light etc etc).
If you've replaced the ABS hydraulic hoses with plain 'lever - calliper' hoses (I understand the reasoning!) then you'll have to find some other way to activate the brake light, which will involve 'hacking' the electrical network somehow.