I have small hands and had trouble reaching the Mafac levers on the 1971 PX-10 that I restored. To bring the levers closer to the bars, I first took the plastic caps that come on inner tube valves and drilled a hole in the end. Then, when installing the cables, I put the cap between the lever itself and the lever body, then ran the cable through. Once installed, the plastic cap keeps the lever from opening fully, thereby having the lever in a better position.
I got the idea from the following video: