Used to have a Rolleiflex TLR - taking pics from waist level is my all time favorite way to take pics.
You can get a camera with a side flip screen and this will get you vertical and see what you are shooting. very common for a camera model these days.
and you have this model that will do a back flip
the screen does not interfere with the holding of said cam
Wondering if there's any modern equivalents. Like maybe an articulating screen that extends all the way on top of the camera.
This may not happen due to engineering constraints, getting rid of top flash imputs are not so popular.
I've tried with articulating screens that just flip up, and it is not quite the same. The handling is awkward.
You other solution is to rig a tethered camera to a viewing screen, where you can place that on top of your rig.
Good luck finding something for you.