The "good" impact does work. You can very easily remove it with a breaker bar & socket you just need a helper to lock the flywheel. There is an access panel and a special tool or you can just use a pry bar (do not actully prying anything just hold the flywheel with it)
And an impact will tighten it up, but you will not get the stretch out of the bolt. I have done it both ways and it is amazing how much that extra 90 degrees is. Important or not.....maybe - but I am sure there is a reason.