I can totally understand your frustration! I wish there was a product available that could do everything I want, but there isn’t, and I have access to a 3D printer through my local makerspace. I will say that there are a bunch of ways to get prints made and shipped to you if you don’t have access to one. I also think that lots of people 3D print things when they don’t need to. When I make the enclosure that I mentioned, only the bare minimum will be 3D printed, and the rest of the enclosure will use off-the-shelf parts, a readily available backplane, and will be able to be built with simple tools.