The only one that works is the Inon UWL-H100 don't get the dome it won't work with it. If you do video you may consider the nauticam wetmate it only restores the air field of view but for video 25mm is quite wide already
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What about video? Does the rx100 III not take better video? Thats what I had thought?
You'd made a very good purchasing decision! Enjoy your new toy!
RX100 3 has many video features advanced users want that 2 doesn't:
3-stop ND filter build in
Full sensor readout
XAVC S codec
Zebra
Focus Peaking
Clean HDMI out
24mm equivalent FOV
Less in-camera sharpening
Flatter video profile that captures more details in highlight and shadow areas
Consumers generally prefer out-of-camera videos to have lots of contrast and sharpening - RX100 1&2 videos. Advanced/pro users prefer flatter profiles that capture more dynamic range so that highlights are not blown out and shadow details are not crushed in camera, and less sharpening too - RX100 3 videos.