USB-C power connector
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platima commented
Since USB-C is the defacto standard these days, can do 20V @ 5A, and means I don't have to buy more barrel jacks
platima commented
STUSB4500 looks like a good USB-C controller, and is used by https://www.sparkfun.com/products/15801, but LCSC stock appears quite low.
onsemi FUSB302BVMPX looks like a very good alternative, with plenty of stock, and a fraction of the price.
The USB connection could also then be used for flashing the ATmega328P/4809 if you have someone modify the software to also include a bootloader such as Optiboot.
https://github.com/ReclaimerLabs/USB-PD-Breakout has this integrated nicely already it appears!