I heard talk that seducer is a good set for PvP healer especially just going into it. I would make it heavy with impen .
Skill wise cleansing ritual and Ritual is advisable in PvP along with rune. That's what I used to level up in battlegrounds and found it very effective.
Yes sword and board is what many people seem to do for PvP healer, but didn't have issues not doing so. Healing ritual is amazing even with current 1.5 seconds.
I also suggest a posion Lighting charged staff in theory to give you concussion and majo defile in pvp support.