I used a stem extender on my CCS. No problem with brake/shifter lines. Plenty of slack left. It didn't bring it all the way up to the "sit-up-and-beg" posture of a cruiser, but it was much more upright, which I like.
With the Black Friday prices Juiced is running, you could get a HyperScorpion, with many of the advantages of the CCX plus a few more (turns out I really like having turn signals, didn't think I'd care), and a decidedly upright posture, for the same price as the CCX usually goes for. If you're any taller than Tora Harris (6'3"), pedaling may be too awkward. With the Tall Seat accessory, it works just fine for me (5'10".)
Or, like Timpo said, look around at some cruiser bikes.