Is there anyway for a character to take Shaman as a multi-class feat, and acquire the Healing Spirit power?
Mending Spirit from primal power (p 148) gets you there. Although you already have to have taken Spirit Talker first. There is no other entry feat to Shaman.
Mending Spirit [Multiclass Shaman]
Prerequisite: Spirit Talker feat
Benefit: You gain the shaman power healing spirit, but you can use it only once per encounter.