Sounds good, WYSIWYG, but it does sound as if it all takes a lot of time, something I don't seem to have much of to spare!
A wise friend once said, It takes longer, if you don't start.
The method I outlined does take time, but not all at once, and that's the beauty of it-- it only takes as much time as you are willing to give it. If you move it offsite, you can procrastinate the beginning until your commitment level rises. It WILL rise, if the better-organized space you give yourself to replace the cleared-out mess receives regular upkeep. That's where commitment has a chance to grow.
Of course there is also a disorder known as obsessive-complusive hoarding. I've had friend who had only a narrow path between shoulder-high towers of accumulated "treasures" to get from their shoulder-deep bedroom to their newborn baby's crib-- which was, itself, set in the midst of shoulder-high towers of stuff. I was the only person they'd allowed into their house in years. Their older girls were pretty frantic about how they were living thanks to the yoked-together OCD disorders of their two parents. I got the family to work on this.... Because of the OCD I knew I would not get far-- with the parents. (They needed meds they were unwilling to try.) But I knew that because I involved them while I was there, the girls learned how to deal with their stuff. They gained skills I hope they used once they were old enough to move out.