Exterior Wood that Bends

I’m currently involved with a project which original was suppose to use a composite material (Trex Deck) to wrap along a tall contoured wall on the exterior of a staircase. The owner has now expressed interest in using a natural wood… he’s suggested Ipe / Teak / Redwood… I know that Ipe and Teak would be a nightmare to try to bend around those curves… unless we made relief cuts?

Anyone ever work with Ipe or Teak in this kind of application? Would I be better off suggesting redwood or cedar for ease of use? Thanks ahead of time for your input!

-- Chris G. ; Los Angeles, CA