Having a group of internal experts in Deming, lean thinking, six sigma, etc. can be an good way to help the organization transform but they must 1) practice respect for people and 2) focus on building organizational capacity. Having, for example a few experts that are very focused on lean thinking and can be tapped by others in the organization I think can be very useful.
That group might well also serve as “change agents” which can make some people get mad at them. They can help push the organization to change. While it might be nice to think you can just show the wonderfulness that is lean thinking and everyone will immediately drop all their old habits and embrace lean thinking that often doesn’t happen. You might well have to push middle mangers (and others) outside their comfort zone. And you might well have to push people to really try this stuff and they have become so disheartened over the years by promises of new, better, ways to work. They just see this as one more lame pointy haired boss attempt and they may well not want to play.
A big focus should be on making improvement in the performance of the organization, obviously, but also on making it clear that this new way of doing things is helpful and will make it a better place to work. The role of internal management improvements efforts is to build the capacity of the rest of the organization to improve. Six sigma efforts often instead put the emphasis on six sigma experts doing the improvement instead of coaching and providing assistance to those who best know the processes to improve, which I see as a mistake.