Hi sir,
I specialize in website recovery and might be interested in working on your website.
However, here are a few things to keep in mind. I have my own SEO recovery method which is likely to work much better than the one you have outlined and if we end up working together, this is how we will proceed.
You do NOT want to contact webmasters tool when deleting backlinks. If Google does a manual review on your website, you will not be able to recover it for months and potentially ever.
There is another, better way, and yes it does involve sending a disavow file, but in a very specific manner that will greatly speed up the process.
Contact me here if you are serious about this.