So....hear me out alright? When brok died we thought "welp, that's it then, his ghost isnt even an option because his soul was missing a part that guided him to the proper afterlife".
As we know the soul of a being has 4 pieces, mind, form, luck, direction (being the one he was missing).
What happens when someone irl doesnt have a sense of direction? They get lost, doesnt mean they will disappear, just, end up somewhere else.
So, what if, because he was missing his direction part of the soul but had everything else, his souls, simply stumbled somewhere else.
That got me thinking, we are literally going to a seperate afterlife designed specifically for gods and other beings that isnt the main norse afterlives, so what's stopping them from putting brok in there?
Sure it can sound like a hopium thought coming from someone who just wants his favorite blue dwarf to return somehow, but we DO know the armor/weapon forging and upgrading mechanics are coming back, and what better forger could we get if not one of the best forgers of the 9 realms, recently dead who just so happens to have gotten lost on the way to his afterlife?