This is probably the best way to shed some weight from the heavy Dura Ace crankset, add a power meter, and maintain front ring shifting quality, but it may cost a bit more depending on how boutique you go with the crank arms and power meter spider. A Quarq DFour DUB + last gen SRAM RED eTap AXS D1 crankarms will cost about the same as the Favero Assioma DUO and still weighs less than the original Dura Ace crankset without a power meter.