Relay default Vsw matek

The Matek H743 has a useful 9v rail (Vsw) that can be switched on/off from the RC tx. Im using this to keep the VTX off while acquiring satellites etc.
Ive noticed that on battery connection, the rail has 9v for about 10 seconds while the FC boots, regardless of the RELAY1 DEFAULT setting.
Probably nothing can be done about this and its just the way the Matek boots?
I would like to power a gimbal from it so that the gimbal dosent go through its boot calibration dance while in the retracted position.

The bootloader sets this so it is powered, do change that you would have to rebuild the bootloader

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