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I was thinking something like the engine that propelled SpaceShipOne, which used HTPB rubber as the solid fuel, and compressed nitrous-oxide as the oxidizer. Would make a good engine for a final stage that circularizes the capsule's orbit, but also either retain enough delta-V to put the capsule on either a free-return trajectory 'round the Mün or Minmus, or simply to deorbit the capsule entirely.