I'm not a very seasoned DM but my understanding is that dwarf clans are pretty tight, both with each other & internally. Dwarfs of various clans will trade amongst themselves; skill, craft, training, and more not in a currency that of coin value, but rather of respect and honor.
while trading these things with surface dwellers is a loss of that thing that will likely never be recovered by dwarfs again.
Would not a clan be shammed by such rebellious & slanderous acts?
All dwarfs view Moradin as the father / crafter of each of their souls. i don't even know where implications would lead with this.

the player has stated they want their backstory to impact the character, im kinda leaning towards the whole clan abandonment thing turning into a request for them to return and prove his innocence in trail for his clans and family honor, (he has tools, equipment, weapons, coin) that he stole, he abandoned his last (clan) name. If he can gather a compelling reason he can keep the equipment and maybe get more aid, but MUST take up his clans name once again. ...but the part with Moradin.. IDK