fwiw, I've been running the original Raspberry Pints with flow-metered kegs since 2014 and would saw off a leg before I gave it up
That version has been rendered unbuildable due to OS and package changes since, but there's a refreshed version with all of my hacks included available for the Raspberry Pi. Check the tail of this thread [Version 2 Release] RaspberryPints - Digital Taplist Solution
The whole works now installs with a single command