For those who are interested, I just talked to an Enphase representative and will be switching to their IQ gateway and monitoring. They are offering a discounted price of $699 (installed) for the gateway and monitoring service, and don’t need to touch the microinverters or the PVS. They will install the IQ gateway alongside the PVS. I don’t know yet what the situation is with the CT clamps; they might repurpose the existing ones or install their own.