Hi there,
You speak of “Through Hole Design” gone the way of the dino… Everything these days is surface mounted no holes , One less process step and one less possible problem.
look at this foort print from the Link above.
HTH
GL 
PJ 
the OP came up with his own Solution LOL, However. It appears to be a combination of suggestions that provided the info to solve the problem, Thanks for contributing to the discussion. 
btw the footprint doesn’t work 100% the USB-C mounts have no Clearance holes, not all the Xiao’s are 100% flat. I will say It’s been a long while since I have seen one with any issues hanging down, Also the trace widths are too small.