The community has already the "
Pathfinder Unchained Pack" that gives Unchained abilities to other classes like Bloodrager. I have a new archetype I will be adding for the Unchained Rogue that will allow it to gain access to those other Rogue Talents.
Currently for things like the Unchained Ninja there is an option on the class that lets you pick which set of Talents to gain access too (CORE Only, Unchained Only, or Both). I can add this same logic to the Unchained Rogue.
Hmm I need good name for this though. The "Unchained Unchained" Rogue Archetype? LOL