Instead of 4809 or 328P why not step into the 21st century and use a ATmega32U4?
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platima commented
4809 - US$4.0, limited stock, req UPDI.
328P - US$2.2, plenty of stock, still req UPDI
32U4 - US$4.6, BUT, includes USB connectivity
Should be compatible - same 16MHz clock, plenty of pins, alreayd used by the Micro, LilyPad, etc.
Could pair well with a USB-C port.