Well you can swap either Inquisition or Knowledge domains for Knowledge Devotion. (By the sidebar on page 53, it states that inquisition counts as Knowledge for the purpose of trading domains). Also, if you end up taking DK 10 (I highly suggest it), you can put back in 3 levels, One of which could be contemplative to get the domain back, if you want it.
Supernatural Miracles is very tempting in Op level 5, and there's always Persistent Foresight (thank you, Knowledge Domain)...
OK. Cloistered Cleric 3/Church Inquisitor 5/Dweomerkeeper 10/Contemplative 2
Domains: Planning, Magic, Knowledge, Luck. Swap Inquisiton for Knowledge Devotion.
Flaws: Noncombatant, Vulnerable
Feats: Extend Spell (Domain)
Magical Training (Sorceror) (1)
Persistent Spell (H)
Divine Metamagic (Persistent Spell) (F1)
Reach Spell (F2)
Craft Wondrous Item (3)
Knowledge Devotion (Swapped with Inquisition domain)
Divine Metamagic (Reach Spell) (6)
Chain Spell (9)
Divine Metamagic (Chain Spell) (12)
Easy Metamagic (Persistent Spell) (15)
Leadership (18)
Mantle of Spells: 1. Either Break Enchantment or Revivify. Not sure which.
2. Heal is hard to pass up. Cometfall can be nifty, but Heal.
3. Spell Turning. Thank you, Magic domain.
4. Not really anything here. AMF is no good for a buff cleric. I'm looking at Holy Aura or Greater Spell Immunity, but I can't decide.
5. It's hard to top Miracle.
Thank you all, that feels like a build.
And yes, I'm assuming that this works, but it's a cheesed-out game. The 1d2 Crusader was listed as an acceptable level of cheese in the OP, and I think Reach + Persist is fairly similar.