I do appreciate the effort, and in general I think this is not a bad idea. I have also made some major rewrites to questions in the past to try to keep them from getting closed or to try to reopen.
I haven’t reviewed any of your edits, but I want to share some thoughts about the practice. Again, I’m not saying that these apply to your edits on this question, as I have not reviewed it.
When editing a question that already has answers, make sure you don’t invalidate any existing answers with your edit. If a question requires such severe edits that all of the existing answers are invalidated, then the effort is sort of wasted. (The purpose, after all, is preserving answers.)
Preemptively editing questions that have not yet been closed is tricky. Yes, it is good if you succeed in keeping the question from getting closed, but the danger is potentially changing a question that is really good as-is, overreacting to a lone close vote.
I think these actions are valuable in general, but keep in mind that it is very labor-intensive. If the only reason we are doing this is to keep good answers from getting deleted, that is a shame, as it is very easy and requires no effort from anyone to just refrain from deleting the questions.
As well-intentioned users such as yourself begin the slow process of trying to rescue questions from the reaper, I would ask the mods once again to refrain from deletion. You can’t assume that a question that hasn’t been edited has no support. It could be that the question is okay to be reopened as-is, or that it just hasn’t been noticed yet, or even that it did indeed receive enough reopen votes, just not all within the required short time window. Deletion makes the question almost impossible for anyone to find and fix.