With the introduction of the 1,16 nether update the nether is now habitable but unfortunately there isn't a way to start inside of the nether and work your way to the overworld for that extra challenge! My addon changes just that!
Select version for changelog:
Changelog
Fixed an issue that caused lava to flood in when the player spawns
Made bonus chest loot based on game difficulty
Bug fixes
link:
Also - an idea for a new version? Instead of blackstone and enderpearls etc in the chest (which are readily available); How about some items that make the Nether experience complete, rather than just attempting to get back to the overworld; eg a stack of Lapis, and perhaps a water bucket or two for eventually brewing potions? You end up with heaps of XP (if you can survive without dying); and although it's possible to make an enchanting table, cauldron and eventually an anvil; all are pretty much useless without Lapis and water. Yes, you can pop into the overworld to get them... but it still feels like leaving the nether 'destroys the experience'. Cheers for the ad-on though.
PS: It looks like water bottles can be traded from Piglins in an upcoming Java version, but not sure about Bedrock. Oh - and a brewing stand still needs Cobblestone; so a few of those would be good too.