Armand Assante
http://www.imdb.com/name/nm0000800/?ref_=tt_ov_st_sm
Definitely plenty mature, and I think he comes across as fairly short, broad and rugged looking in his various roles (he's 5'10"). He has played Napoleon, Alan Breck Stewart in 'Kidnapped' and Odysseus in 'The Odyssey' (granted, 20 years ago, but he is still fairly active). More recently, he was in 'Once Upon a Time in Brooklyn'. I think he has the ruddy complexion we were looking for, and his characters are often rogue leader types, so...that fits Aulë well. He is a father in real life, and has played a father/mentor on film multiple times.
Oh, and he can sing!
Here is a taste of his work:
For him playing a somewhat 'rough' (non-mob) character, see him in this scene from 'Kidnapped' (51:30-1:02). For a different 'look,' he wears a more appropriate (ie, less French) costume at the end (2:42-2:44). I won't pretend that he does an accurate version of a Highland Scottish accent, but probably would pull off 'non-American' accent just fine.