Hey,
I have created a tool called
Ultra Modular Landscape with the aim to bring a fresh approach to landscape material creation and mountain sculpting in UE5. You no longer need to touch the master material when you want to add or remove landscape layers due to its modular nature. Not to mention it has all imaginable material features built in and ready to use. Additionally with the Blueprint Prefab System you can spawn complete mountains with a click.

If this is something you might find useful, then check out the trailer for a quick feature rundown and the tutorial for a more in-depth explanation where I showcase how to create this Icelandic scene from scratch.
Trailer:
https://www.youtube.com/watch?v=RIr-3iJTADYTutorial:
https://www.youtube.com/watch?v=5kPxYtY2Qbk