Adding a new always-known spell to oracles
 

As a house rule, I want to add a new spell available to all oracles using cure spells (cure deadly wounds aka breath of life). How can I do that in the editor?

Extend Thing seemed the way to go, but Cure spells are actually bootstrapped to the class so that shouldn't work. Is there some other way aside from creating a simple archetype that just does it and making sure all oracles take it? Some mechanic that kicks in only if character is an oracle with cure spells?

Thanks for the advice.

Respectfully bumping question