ZQZ 300pcs M4-0.7mm Hex Nuts Stainless Steel Hardware Hexagon Nut Standard Metric Coarse Thread A2-70

Its not a threaded insert, just a regular M4 hex nut, like this: https://www.amazon.com/ZQZ-M4-0-7mm-Stainless-Hardware-Standard/dp/B0CQJJV8Q8/ Adding a hole is possible, if you are using BambuStudio as a slicer, you can just add a negative shape(thats how i added the weep hole). My UTP comes directly out from the wall, so i didn't need a side exit.