Update on my end. 

I actually swapped my old RPI case to this one
Argon ONE M.2 Case for Raspberry Pi 4 • RaspberryPi.dk

Together with an M.2 drive it can now run without an SD card.

Performance boost is insane  

Also, I swapped from a passive 4 port USB 3.0 hub to the 8 port active one [exactly same model as has been described in the previous topics] 

That said, adding a 30000 mA battery and running with Pegasus Pocket Power Box made it really slick with only 2 cables that are not mounted on the OTA  

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