Neat! ...and to get rid of the the mechanical / button stuff, you can add a touch panel, such as: https://www.ebay.com/itm/Factory-Outlet-1-4-inch-Resistive-Touch-Panel-Screen-with-Soldering-FPC/292819160320 ... It is a bit larger than you need, but there may be others around... even capacitive one. The resistive though are 'passive' - no noticeable power draw. - on the other hand, the touch panel could be activated the same time as the display comes on.
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