It's borderline impossible to use with one hand, and hard to avoid dropping occasionally because it's so much heavier and harder to grasp. It's so slick that it regularly slides off of almost flat surfaces.
My next phone will be 5" or less. I have the same size preferences as you, and also owned a Nexus 4. I still think it was the pinnacle of the cell phone form factor.
Next, the screen to body ratio has changed screen sizing specs a lot. Phones are very much still sold in the iPhone 8 and Xperia Z3 Compact size.
PS: additionally, I'm actually not all that happy with "better" screen to body ratios, coming to the XZ2c from the original Z1c. Accidental touch events from the holding palm at the screen edges are a daily nuisance for me.
You seriously do sound like the kind of person who needs to try a Popsocket. Screen palm edge issues begone!
I did just test it vertically and it seemed to work if the PopSocket itself hung onto the lip of the charger. I think this might affect the charge rate, though, due to the distance from the coils.
[1] https://www.anker.com/products/variant/qicertified-powerport... [2] https://www.anker.com/products/variant/wireless-charger/A251...
My hands are (to my knowledge) average size, maybe a slight bit on the small side.
Really wish more vendors made high-end smartphones below 5"... (I previously used a Z1 compact, and before that a Nexus 4 - loved both.)