Allright so this almost 6hr session was me just staring into a datasheet lol. And I still doesn’t understand the STM chip all that much
So I’ve reverted to theft I mean I took inspo from other implementations of this chip.

After that I’ve started thinking about the USB to UART convertor.
My first thought was the cheap ch340 IC but after finding that it isn’t that available online, I’ve went with the CP2102N which also has good driver support.

And also the converter is only going to be powered with just the USB to conserve powah.