AUX for camera trigger on smaller FC?

Hello all,
I’m looking for a smaller/lighter alternative to the Pixhawk. 
I need to use ardupilot’s relay-type camera shutter, with a fixed-wing craft, for automated flights with shutter triggered automatically (on the Pixhawk, I’d use the AUX/RC ports).
I also need to use Emlid's Reach RTK-GPS.
I started to look at Pixracer and PXFmini - I'm trying to find out if there is any possibility of AUX OUT for triggering cameras on either. Does anyone know? Or does anyone have any other FC to recommend?
Thanks a lot,
Fred Jean

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