[X] Instruct them to go down a blind alley, where Viserys and Richard will be waiting unseen.
-[X] Immediately cast False Future on both of them, planting an image of them leaving the city and being waylaid by bandits at some point while traveling to another settlement.
—[X] maintain this effect for at least two days, using scrolls if none of the companions are available.
-[X] cast Smokey confinement on both of them, then leave the city from a randomly select safe plane shift point for the plane of air.
-[X] Fly for 15 minutes in a random direction, then plane shift a second time to SD.
[X] Keep it simple, they go down a blind alley where you and Ser Richard wait unseen within a wall, one spell and you are in the deep beyond prying eyes and ears