Can a swamp druid Turn on channel foci?
Channel Foci:
Activating a focus is identical to channeling energy, but instead of directing the power outward, the cleric (or other appropriate character) directs it into the focus, expending one use of channel energy. This triggers the item’s ability; the channel does not have any of its normal effects (for example, a cleric channeling positive energy through her focus would not heal living creatures or harm undead in the area). The cleric must wear or hold the focus, as appropriate. She can still use channel energy in the normal way, even while wearing or holding a channel focus. An activated channel focus radiates faint conjuration (positive energy) or necromancy magic (negative energy). An unactivated focus is completely nonmagical — it is a channel for the magical positive or negative energy, but has no magic of its own.
Swamp Domain Druids channel:
Natural Healing (Su): You can channel energy (as a cleric of your druid level) a number of times per day equal to 3 + your Charisma modifier, but only to heal animals, plants, and vermin. You may reduce the number of dice healed to cure ability damage (your choice) to all affected creatures, curing 1 point of ability damage for each d6 that the channel energy is reduced. You can take other feats to add to this ability, such as Extra Channel, but not feats that alter this ability, such as Elemental Channel and Alignment Channel.
Per the RAW this should work, but it does seem to go against the intent of the items as I interpret it. Were I the GM, I wouldn't let it fly.
Limit what the channel foci can affect in the same way that the natural healing ability is limited (animals, plants and vermin only). A 'the type of channel that goes in is the same type that comes out later' kind of thing.