Hey, Reincarnate doesn't need a body. If we don't have the time or inclination to find a True Resurrection for Marlowe, we could ask the Treants we met at the 'stones if they know a Druid.
Sure, there's a possibility he might come back in a fucked-up body, but... Alternatively, Resurrection itself needs only a small part of the body. It's still a level 7 spell, though
Of course, that's only if Marlowe decides to die for the cause.