The 30 - 40 years part is key. You need to support them for a generation. You need to let the remnants of the old power structure get old and die. The country has to be full of people that were raised with the benefits of the new government.
You can look at Japan for a great example of this type of success.
Dark Knight, Fury Road, and... Hellboy 2019.
I feel like Hellboy is a hot take. It bombed and even other Hellboy fans seem to hate it.
If you like sarcastic Brits and the Craftsman, please check out Bill Making Stuff.
You should get on discord! It's like the instant messenger of our youth but with more features. You can find a discord for every hobby.
Go to a small local jeweler. They can often make you something custom for much less than the price of a chain store. They'll also be able to walk you through all the options and advantages of each. If you're having trouble finding that little mom and pop spot, Google jewelry repair. 9 out of 10 of those businesses will be more than happy to take on your project.