divine equivalent of ultimate magus?

[Falcii]

really just what is says on the tin, are there any clean ways to theurge two divine casters together? divine soul and archivist ideally but even cleric druid could be neat.

[Crake]

You could probably make a divine version of UM, though archivist and divine soul is like the ultimate in spellcasting mad, as you need int, wis and cha all at once

[Anthrowhale]

Hathran is maybe in this vein? Circle magic elevates caster level and Hathran also allows you to cast spells from one list with slots from another.

[Rebel7284]

Green Whisperer with Druid and Divine Bard?

[Chronos]

You could maybe use Alternate Source Spell or Southern Magician to make one count as arcane, and then use Mystic Theurge?