As long as we’re dreaming, how about a single-issue amendment? No legislation that addresses more than one issue. It eliminates the “and for other purposes” which is where the intent usually lies.
Would major overhauls require a new charter for Congress? They rewrite the rules all the time, and there would have to be a way to put in writing to make sure things that will ensure efficiency and good intent stay put in the rules for as long as possible (because we all know all good things must come to an end some time).