I work in change management, this is exactly my field. Let me give you the bad news first: the resistance isn't personal, it's systemic.
For someone who has worked the same way for thirty years, a new method means three things: slowing down, risk of making mistakes, and losing their expertise in that area. All three are real losses. You're talking about gains, they're experiencing losses.
The method that works is this: design the change together with the most experienced person, don't just announce it to them. If that person turns from resistor to advocate, the rest of the team will follow within two weeks. In our projects, this alone was the most decisive factor.
Second: don't shut down the old method immediately, but make the new method easier. People choose what's easier. You win by making it easy, not by banning things.