gphoto2 with Sony ILCE-7M2 (a7 II)

Hi users of gphoto2,
for a series of pictures I need to alternate between two configurations, i.e. take one picture, change configuration, take next picture, change to other configuration.
I have the commands for the two configurations:

1st configuration:
gphoto2 --set-config=/main/imgsettings/iso=1600 --set-config=/main/capturesettings/shutterspeed=50/10 --set-config=/main/capturesettings/f-number=16

2nd configuration:
gphoto2 --set-config=/main/imgsettings/iso=0 --set-config=/main/capturesettings/shutterspeed=1/40 --set-config=/main/capturesettings/f-number=1.8

The commands work but it needs quite a long time until they finish because the camera is walking through each single step from ISO 1600...0 (auto), then shutterspeed 50/10...1/40, then f-number 16...1.8.
Each single step take ~0.5sek, so all steps together need >40sek to complete.

Is there a setting I can change to speed this up? (deactivate camera screen for example?)

Our Nikon D750 changes everything in one step within a second...

Thank you very much,
Jonny

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