You could always use aero levers. You can get the nice Tektros for $20 plus shipping.

Seriously though, I believe I read of someone who had used the cross levers with non-aero levers. As long as you can get the cable to the proper place with a fairly smooth curve you should be fine. You would have to experiment with the length a bit. It may not be elegant looking but, theoretically, it should work.