I ordered a batch yesterday from JLCPCB and the pin headers I will need to solder on. I think I will be able to do it with traditional soldering iron instead of hot air.
I haven’t done the USB-C conversion myself but it should be doable with a breakout board. The case would need to be modified slightly as USB-C is slightly wider. Change USB Connector Type
I would like to make a PolyCarb plate as well. I haven’t seen anyone with the plate files for this model.
There are sites to help generate plate files but trying to hold myself back and only do one experimental thing at a time. My plan is to make this PCB hot swap with Holtite sockets so it will be quick to changeout.