Polycam came through. I scanned this in May of 2019 with my Mavic 2 Pro, flying manually in the DJI Go 4 app. I tried to process the photos with Meshroom but the water was causing problems. Maybe there are ways to fix that, idk, I didn't look into it. Fast forward a couple of years and Polycam has a cloud-based option for processing photos, I toggled "Object Masking" and voila!