The most crazy thing I did this summer:-)
At a very hot day in Guangzhou I walked through the old district of Dongshan for a photography documentation of these (more or less) well renovated buildings from beginning of 20th century. For basically all pictures I used the GFX50S with TSE 24 - with shift - without tripod! Typically I set the exposure to ISO 100, f11, 1/125 (in the sun), but even 1/30 (in the shadow), hold the camera up in front of me (in landscape or portrait orientation), tilt the monitor down, shift the lens up as much as required, press the button for zoom-in for adjusting the sharpness. Then the tricky thing is to hold the camera horizontally in both axis (I use grid and horizont). Works pretty well, after some exercise I achieved a very high keeper rate with critical sharpness.
With that method you are so much quicker than setting up a tripod.
Looking forward the IBIS of the GFX100 ... that will be even more helpful.
Two examples. First 1/125, second 1/30.