Add an enchantment called soulbound that can only be put on a CB tool. Whenever you die, you'll still have it on you. Same idea but different

That's a bit OP I reckon

It'd be super hard to get. Maybe a secondary use for the corrupted nether star?

I don't overly like the idea of adding new enchantments, especially since I'm pretty sure there is a mod out there that might already do this.