Simple way to disable the Nether (or make it custom)

I'm trying to make a datapack where you don't need to be in the nether (or if you can access it, it break the flow), so any way to disable player access to the nether or even change the nether dimension to not to be the default one could be helpful :) For now I'm removing all access with fill all nether_portals with air in an area around the player every 10 ticks, and idk if there's a more "elegant" solution or the like