The following is a link to statblocks of (mostly) official 5th edition Sorcerous Origins unofficially Birthright-ified.

Most of the changes are cosmetic, for the purpose of attuning the Sorcerer class to the Birthright Campaign Setting. Changes to the mechanics of the subclasses were intentionally minimal and are summarized below:

The Sorcerer Scion of Anduiras uses the unmodified statblock for Clockwork Sorcery.
The Sorcerer Scion of Azrai uses the unmodified statblock for Shadow Sorcery.
The Sorcerer Scion of Basaia uses a modified Gold Dragon Ancestory statblock.
The Sorcerer Scion of Brenna uses the unmodified statblock for Chaos Sorcery.
The Sorcerer Scion of Mesala uses the unmodified statbock for Storm Sorcery.
The Sorcerer Scion of Vorynn uses the unmodified statblock of the unofficial Runechild Sorcerer created by Matt Mercer.
Revered One uses a slightly modified version of the Divine Soul Sorcerer statblock.
Elven Sorcerers use the statblock of the Aberrant Sorcerer, modified to make the subclass less focused on 'aberration magic' and more focused on "ancient elven mind magic".

D&D 5th edition Sorcerer Class Features and Sorcerous Origin Options for Birthright