As the external shutter remote only control the shutter, the only way to remote the recording is to use a IR remote. But the IR need to be in front of the camera as the sensor is inside the camera hand-grip, not very convenient.
You need to remove the front adhesive layer (there is 2 layers) with a cutter and gently remove the IC board. (Remove the battery before, of course). There is a small switch at the back to delay your remote order. Keep it in “no delay” position to avoid waiting time at each take. I remove the switch cap and use the empty hole for my remote wire.
The Shutter control
The remote is a cheap copy of the canon shutter release but any brand will do. In fact, any push button will do, so a bell push button is fine also
There is 3 wires, but you need only two, you can exchange it, no worries. Usually, remote allow “half push” for focusing, and “full” for the picture. I decided to use the contact for “half”.
You can now put the remote in front of the camera grip and put the camera in the “IR remote” mode. (Very important…)
Now, you can start stop without losing the first and last second of each clips as the camera shaking…
The finished thing
You also have the HDMI modification there to avoid disconnection during shooting.