The worst thing you can do is to try and make it work. Do everything in your power to make that idea fail, since that is the only way your management will change their minds.
Yes they may change their minds about keeping him employed
Good luck trying to convince potential new employees to come and work in 1 week sprints
You haven’t looked for a job lately have you? I was looking for bog standard enterprise dev jobs as a “Plan B” last year and the year before last.
Every single opening had literally hundreds of applicants in the first week - LinkedIn Quick Apply - shows you.
Hiring managers say the same thing.