Sorcerer blood ability to act as type

[Aril]

I would like to create a blood ability for a sorcerer bloodline that makes the bloodline count as another bloodline for purposes of effects and archetypes.

It's a variant bloodline of the Fey bloodline, and what I want to do is have it count as the Fey bloodline with respect to prereqs for things like archetypes.

I've looked through the Core Rulebook, Ultimate Magic, and Advanced Player Guide and haven't found anything similar (that I can think of).