Based on my positive experience using a Cycleops Powertap power meter for my recovery from cartilage replacement knee surgery, I would strongly suggest the OP utilize theirs.

Despite leg power balance not being a discrete feature, the steadiness of the power reading will help you smooth and even-out your stroke.

Also, power training is the fastest and most efficient way to build strength and power, which will expedite your recovery and development. If there's a power-based coach available to you, I suggest you avail yourself of their service, get on a plan, and learn how to use power.