I appreciate you opening up your case and taking a look. However, no I am thoroughly intrigued. I cannot find any mini-pcie wifi+bt combo cards that have a usb cable connecting to USB internal header. ??
On the Dell Optiplex USFF and AIO, the mini PCIe 1x slot support USB via the slot. (This is common on many laptops, it is also just as common that the mini PCIe only supports the specific wifi card, so 50/50?.). So no separate wire is needed.
Wikipedia Mini PCI-E ALL mini PCI-e ports are supposed to support PCIe and USB 2.0.
I didn't know this until AFTER i tried the same AW-CE123H in the HP 8300 USDT and the BT didn't work in either macOS nor Windows (!).
So looks like IF I want this to work, I need to go with the solution which you implemented. Can you tell me more about the adapter that is has the BCM94360CS in it?