Will do!

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Joep - http://www.disktuna.com - video & photo repair & recovery service

Thanks where thanks is due: @Arch Stanton

His diagnostic bundle gave us exactly what I needed. The ILCE-7SM3 uses a different kkad layout, but the recording sequence is completely deterministic.

For anyone else looking at these structures:

AVC: predominantly 820-byte kkad records
HEVC: predominantly 1492-byte kkad records

(they do shift at the end)

In this image the change in kkad structure lines up exactly with the independently detected 40 AVC and 16 HEVC recordings.
The new build auto-detects the layout. No camera/profile selection is required.