I've started a new topic on this because there doesn't seem to be an obvious way to edit the title of the initial topic....
Here's the initial topic: https://www.alibreforum.com/forum/index.php?threads/macro-keypads.20469/
The Stream Deck is a macro keypad which allows you to display key label graphics on an LED screen which are then visible through each of its transparent keys. There's only a single screen underneath the keys!