it is right topic.
You need something like
https://www.amazon.com/Accell-B104C-003B-40-AVGrip-Locking-Connectors/dp/B002ISTM2E/
But do not see ones with non full size on one side.
You can get separate cable lock on camera side.
Lockport
Works with Sony A7RII and Sony A7SII cameras - Saves the "expensive to repair" mini HDMI port on you Sony A7II cameras - Full-Size HDMI output, allows to use stronger standard cables- Standard size HDMI plugs locks securely in the socket
https://www.lockcircle.com/store/?p=lockport/a7/lockport_a72/
Lockport GH4:
https://www.lockcircle.com/store/?p=lockport/gh4/lockport_gh4/
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