hope this doesn't qualify as a necro, but honestly... so far, the only places i've seen a wand/shield combo be truly relevant has been in three places places. RT plat/diamond on yawaka, sardo first boss, and pvp.
if you're getting hit physically as a healer, your tank is doing it wrong. and from what i've noticed damagewise, you probably won't live through a boss. mind you, this is discounting that you are a money shoveler for this game and can clean t8 + whatever your gear and probably tank as a priest the entirety of GCH. but at that point? you're no longer at a point where it matters, you're just showing off.
i'll admit, i just got a clown want and am gonna go all tiered and get me a mystery shield, and use those. but i'm pretty sure it'll be for siege, sardo first, gonna try on third and see if he still oneshots me, may be good on some trash in GCH, but otherwise, i'm keeping the skelly staff too for bigger heals.