Hi Shaun,
Sure, the LoRa radio link should work for you. I see the setup as follows:
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Reach RS2 transmits base corrections via the LoRa radio.
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Reach M2 receives the corrections via the LoRa radio module connected to the S2 port.
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Reach M2 is connected to Pixhawk via the S1 port and outputs its position in the NMEA format.
Our Ardupilot integration guide contains more info about the setup. The only difference is that it describes how to transmit base corrections via the telemetry link.
NMEA messages provide various info about the solution, including its status. So, you’ll see it in the Mission Planner.