@ming.wen It looks like you’ve already been playing with a Grove plate!
This is exactly what I had in mind. I like the M2 holes for Grove devices and the M2.5 or M3 holes for other boards.
Now, are the M2.5 or M3 holes placed conveniently to host an Arduino, Wio Terminal, Raspberry Pi or BeagleBone, as in the re_computer case?