Oh yeah, in Eberron, Sovereign Archetypes are very much a thing - Loredrake in particular is more than worth burning a feat on Improved Toughness, but the others do have potential too.

Also, may I recommend tossing in a few Blues(XPH) with Psion(XPH) levels? Ardent(CPsi) is also a nice class, maybe Psychic Warrior or Wilder too.

Note that while in Greyhawk and the Realms psionics and dragons can go together fairly well, in Eberron they... don't. At all. According to Dragons of Eberron, dragons suffer disfigurement and ill health if they learn psionics and most also go insane. Doesn't matter if it's just a few rank-and-file psionic goblins in the Horde, but more than that might not be wise.

Fun fact: Gem Dragons can be added to Eberron if the Inspired have made them as Quori hosts. This leads to some fun options.

-These versions of Gem Dragons were made by mixing chromatic and metallic bloodlines "with a touch of fiendish blood"... as if the Daughter of Khyber needed more clawholds in the first place.

-Kul thinks he's being led by Tiamat, but in reality agents of the Dreaming Dark are gleefully BSing him into doing something they want him too, or the whole Horde nonsense is a facade for the masters of Dal Quor to weaken Khorvaire... perhaps in preparation for war.

There's probably more and/or better ideas, but this is just my 2 cp.