What you are asking for appears to be to mimic a "parametric" drawing system in which one object "knows" to be relevant to another object, and move with it, when the first object moves. This, in Autocad, would require -extensive- customization. I don't even know if LSP alone would cut it. Sorry, that's way above my pay grade.
The only other thing I could imagine is to step through every "X" "Y" and "Z" value of each object (or other relevant dimensional properties) and round them off to the closest tenth, hundredth, or whole unit value, and simply hope for the best, and re-inspect the drawing.