if you are looking for something on a newer version, another dev has already done it https://www.curseforge.com/minecraft/mc-mods/fabric-disable-custom-worlds-advice
if you are looking for forge, another dev did that too https://www.curseforge.com/minecraft/mc-mods/shutup-experimental-settings
This mod is client only.
This mod removes the warning that appears when you use experimental settings in world creation or load.
This is an example of a screen that would be skipped:
