Pixies:

https://www.tindie.com/products/connornishijima/pixie-chainable-dual-57-micro-led-displays/

Press fit inserts:

https://www.amazon.com/gp/product/B089VKTLY4

M2.5 Screws: (use the 6mm ones)

https://www.amazon.com/gp/product/B07F14J7X8

Make sure to modify the section for the press fit fasteners in your slicer to have 6 walls.