Sliced off the bottom of a gridfinity USB storage design and added the bottom of the gridfinity with pin instead to make it compatible. Note that the USB sticks are not a tight fit but have a little slack so they go in easily.
I have this deep in a drawer system so found it easy to remix a model with a bit of play to actually get them in easily but I see your point, I'll add a comment to say it's a slightly loose fit to make that clear. Appreciate the comment