Ooh, good question. Looking at the PRD now, the Extra Hex feat implies it can solely be hexes from your spirit, not the generic hexes available to all. I would run it as though you could get Extra Hexes from the core universal list, or specific spirit hexes that are only available when you are connected to that minor spirit, but the rule does seem to read as nixing both since Unsworn Shaman has "minor spirit" instead.
Spirit Talker requires you to have the Hex class feature - I would allow it with no issues, but Unsworn Shaman's Minor Spirit slightly interferes with that. Since it says "This ability replaces spirit and ALTERS hex", I'd use that as an argument that it's still fully accessible.