At approx 15:00 local time we had the first successful test of the power load switch circuit.
For this PoC I'm using the user SWITCH button on the Itsy nrf to toggle the USB charging on and off when it's pressed.
Everything appears to be working successfully hooray!
Next step on the software side is to move over to using BLE to send the trigger to switch charging on/off.
For hardware I think I'm going to hit the USB cable wires with some hot snot for strain relief, print up a little box to stuff it inside of and call it good.