3rd Party Vertical Grip for the Sony a7 Cameras
Here is a third-party version of Sony's VG-C1EM Vertical A7-Series Camera Grip by Meike. Their model designation is MK-AR7. It duplicates the front and rear dials, shutter button, and the C1 button for use in a vertical shooting orientation. It provides room for a 2nd battery to extend shooting. It also has a receiver for a wireless remote with timer for time lapse photography.
We have not used this Meike MK-AR7 ourselves but the price is very tempting. The added battery is a plus but we always carry extra. The support provided by the grip is the major feature of this grip. We always have to warn people that 3rd party accessories causing damage to your Sony a7 will not be covered by warranty.
See the video and data sheet below to see if the MK-AR7 will work for you.