I think that learning something like laboratory electronics is a bit different than teaching chemistry or biology. I’m not sure I’d want students who have never handled chemicals before to be trying out chemical syntheses at home, for example.
I understand your point. However, as a child I had a chemistry set that allowed me to do quite a few different experiments. I not only learned about acids and bases, but did things like making soaps and dyes. (I also made fireworks, but those weren't in the manual.) I think a chemistry lab could be based on the same sort of kit.
I had a microscope set that included some already-prepared slides, but which allowed me to make my own slides of things like slices of plant stems and pollen, and to see the microscopic critters in pond water. I think a biology lab could be based on a similar kit.
I had an Erector set that I used to make quite a few contraptions. I think a mechanical engineering lab or a structures lab could be based on a similar kit.
In short, I think it would be possible to make kits that would give suitable lab training in a variety of sciences. It would take careful thought, but we do hve examples to draw on, such as chemistry sets and Erector sets.