Problem is he's got internally routed cables. So that would work for the front, but for the rear would need to disassemble the brake line from the caliper, and bleed and refill it. Not the worst thing to do, but another step and cost. Though he could run it himself, and take it to a shop for bleeding.
My brief reading says you can buy a sensor compatible hydraulic leaver that you just swap in. You would also need to bleed it for that. But that's the correct way of doing what he wants.
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