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I'd be tempted to start the mods as close to the pivot as possible. Getting it strong enough is trivial. Making it stiff enough will be the harder part. If you just cantilever off the end of the existing pedal arm you might well find that the pressed steel part twists and flexes as it's not designed to be stiff for offset loads.
Brommers
I reckon match a piece of tubes OD to the maximum width of the arm just below the point that the sensor mounts, get a hole saw of that same size and go through the arm perpendicular to the long axis, weld in the tube and weld on the lower section of the arm to the left. Garnish with gussets.