I roll with C1 - P3 - Chap - Oracle1 - PD1 - Inq2 for pvp. Have been rank1 on Klaipeda and generally place in the top10 weekly.
Yes full CON is pretty much the meta now, and it really helps to have revive and resurrection so I would highly recommend at least P2 in any cleric PVP build.
Paladin offers very little for pvp beyond circle1 for smite. Smite is a nice quick knock up similar to Earthquake, but you need high block pen.
The current frosterlord meta pretty much requires PD1 in your build to consistently rank high, since enemy parties that have it will be at a huge advantage out of the gate. If they realize your team doesnt have Bloodletting, then they will rush you down and win most of the time.
EDIT: As a support, having stage6 in your armor pieces, at least stage4 will boost your survivability dramatically, and your goal is to stay alive moreso than to do damage as a cleric. Inq builds want to focus their efforts on slapping malleus on as many targets as possible and keeping it on them to neuter their offense or to destroy them if they don’t weapon swap.