The entire licensing issue "oh so they
can't do that!" and how people will almost certainly make excuses for them if they go just with a "single" dwarven civilization (with another lords/domains being an extension of Khazad-dum at best, if mentioned at all) is already becoming pretty - I would say funny but not really, because I expected a nicer show! - sad. Since you know, after all... they decided to do the story of the forging... and called it Rings of Power... so it's only natural you would expect them to portray vastly different dwarf lords (so from different kingdoms and lands) who get the rings (which only make sense from Sauron's POV, that they aren't all just from one single place in Middle-earth), and - if they want to correct PJ - the "vastly different" part would need to include different looks/races/cultures, one of the three at least. Just like LOTRO, they can change names. Or they can even refuse entirely to act like they're from "clans" but merely come up with dwarves who live in different parts of Middle-earth so there are some other kingdoms out there other than just Khazad-dum. Or communities organized in different ways, under some sort of leader who doesn't even need to belong to a specific "clan" or a specific kingdom that he rules over, but either way you end up with lords from different parts of the map who all get a ring and you can tell that all these dwarves/dwarven lands are somehow different. Lots of ways they could do that without getting themselves into the whole "licensing" issue by having 'distinct' dwarven clans that act as such. Dwarven kingdoms/clans being very distinct each with own heritage is how LOTRO has done it - and seems the most logical/lore-accurate, as long as you're willing to commit - but it's not the only way. So if, despite all this, they stay *just* with Khazad-dum/its characters and give little-to-no indication there are more dwarven lands out there and more dwarves across Middle-earth with some prominent, different leaders (future ring-bearers) that we can see from time to time... UGH, that would be
BAD. (and yet, at the same time, they would have Galadriel soloing all of Middle-earth on her Amazonian quest... without anything interesting to show for it, location-wise).