Looking good. Here’s that digital potentiometer video I was talking about.
https://www.youtube.com/watch?v=uezoQ5fkixY
Theres some people in the comments saying you could digitise the buck converter without any desoldering or fancy extra chip. May be worth looking into?
You don’t have to remove the original potentiometer of these buck converters. You just need to “inject” some extra voltage to the shorted pins (pin 2 and 3) of the onboard potentiometer through a resistor and by this you can trick the buck controller chip and control it perfectly. I did this already quite some time ago using a MCP4725 12-bit DAC and an SZBK07 buck converter. This DAC has higher resolution than those digital potmeters, so you can control the voltage on a really fine scale.