I can't easily change my crankset or hub, so I'm looking at pedal power meters. All of them (PowerTap, Garmin Vector, bePRO, Xpedo Thrust-E) use Look/Keo/SPD-SL cleats. For me, walkable riding shoes are a must.
Are there adapters from Look/SPD-SL to SPD cleats? Is there another solution to this problem?
ETA: I said I can't easily change by crankset or hub. Please don't reply telling me to do that. The reason being, I have a Pinion gearbox which doesn't take custom cranks, and I have a 158mm rear axle which hub-based power meters don't fit.