The USB TTL header adjacent to the USB port is right below a rectangular hole in the case. I’m looking for a panel mount header that will fit in that. I would rather not use the JST XH2.54 cables which have no outer detent and would just dangle outside the case.
I found this molex header which might be close to the correct size which wouldn’t push inside the case when connecting the TTL cable: https://www.digikey.com/en/products/detail/molex/1053131203/6131615
I’m looking for a better connector suggestion!