I tried this as a quick experiment but it worked much better than I expected so I thought it was worth passing along.
The case of the OSPi/OSBo is nice and clean looking. The only drawback is the way the cover is attached with screws from the back of the base plate. I like to tinker and was thinking it might be nice if there was a set of pins instead of screws so the cover could be press-fit from the front. It could then be removed without unmounting the entire unit.
Looking around the house I found a wire coat hanger with wire that just fit the screw holes of the cover. The wire is about 1.8mm in diameter (13AWG ?) and slides easily into the cover.
I made a couple of pieces (shown below) using a wire cutter and pair of pliers. Filed the ends to round off the sharp edges.
The wires hold the base plate away from the wall slightly but not enough to be a problem. It may also be possible to glue four pins into the base plate but I think the method shown here is much stronger. It also allows for using screws later if desired.
It takes a fairly strong pull to remove the cover. It is a good idea to hold down the edges of the base plate and rock the cover side-to-side slightly when taking it off.