The adapter I purchased points out a few key things. For one, I am not sure that any reader on the market will fit in terms of width. The PCB and in fact the solder pads on the SD card slot itself are too wide.
Now, there are not any electrical elements on that part of the PCB and those solder pads are just to hold down the slot, but I haven’t been able to find any sockets with through hole contacts which would make it more narrow.
It actualy seems to me that the expansion card specification was designed to be just wide enough for a full size SD card as the socket just fits into the CAD frame work provided.
I’ll cut the PCB and 3D print a new expansion card with internal spacing for the USB C to line up which I am pretty sure whill work but it is more of a hack than anticipated.