Honestly, while in DFRPG I'd certainly grant Fomor slightly different powers than a Wizard, for DFA, the Magical Practitioner Mantle seems almost entirely appropriate and sufficient. You'd need to ditch the 'Member Of the White Council' stuff for other Stunts, but that's really the only change needed. There are some indications they can have superhuman physical abilities, so maybe add those in instead of the White Council stuff (the ones under Fae seem reasonable, for example). You might also switch Soulgaze for Loremaster, given the specific proclivities of the Fomor.
For The Black Court, you've got some more difficulties, but probably want to start with the Red Court, replace the Flesh Mask and Saliva stuff with something to reflect their mind control powers and turning into mist, and go from there.