Every so often, I have considered something similar. I knew a lot of songs, many of them note perfect, or close, in the past. But I then thought....what would be the reason to spending the time to relearn it other than the personal achievement. So, I simply write new stuff and don't worry about relearning the old stuff.

But Kudos to you for wanting to achieve this!

You can find my music at:
www.herbhartley.com
Add nothing that adds nothing to the music.
You can make excuses or you can make progress but not both.

The magic you are looking for is in the work you are avoiding.