No question Doug Jones is the pinnacle at it, but it's not like he's the only guy to have ever given a good performance in heavy prosthetics and makeup. Other than making some adjustments to make facial movement easier and expressive in real life, I don't see much of anything about the Turian design that would need heavy tweaking. But you're right in that if all else fails, they could go that route. I just don't think it's that necessary.
I was more referring to the locomotive / legs part. Facial performance is paramount and totally the most important part to get right. But personally I see little value in trying to get a Turian's (or Quarian) chicken hips and legs and feet 'lore correct' since it really doesnt add much besides some novelty / pandering to fans of the series and is just a barrier for the performer.