Isn't it better to precede Hautacam with Aubisque anyway?
Either way these Pyreneean climbs are all very similar in lenghts, gradients, etc, and I don't see super much you can do to change up route designs. Any finish on Hautacam, Luz Ardiden or something won't see much action before that climb. Tourmalet somehow never sees action unless it's a MTF. I guess Cauterets was an attempt at that in 2015 but then it was the 2nd mountain stage and all that happened was Nibali successfully dropping himself.
Wouldn't mind something like Tourmalet, Luz-Ardiden until junction-descent into Luz.