Quick and simple folding stand that bolts into the existing HDMIPI screen and folds flat (ish) against the back when not in use.

Remove the four corner back screws in the HDMIPI, place mounting on correct side (mounting with cut-out goes over the composite out of the Rasp Pi) and use 4 x M3 x 10mm to attach, Then 4 x M3 x 20mm to attach the stands (I used Nyloc's to create an adjustable tension in the "hinge")