A Comfy Chair
Without having the benefit of charts etc, I concede that it will take longer, but 3 hours, I think not.
The great circle route cannot be flown 180 minutes EDTO, no doubt. On the other hand 207 minutes (which would be available after a period of operation at 180 minutes) may change that.
I'm not sure of which suitable alternates would be used, however if Cocos and Mauritius are suitable the northerly diversion to stay within 180 minutes, is not great.
Once again I have no data, but I would think that keeping above 40 south would be beneficial WRT to winds, and although they might be stronger than those below 50 south, I would be surprised if it was a significant difference.
Couple that with the fact that the pax will be given a young aircraft with a vibrant and engaged cabin crew, and an IFE that works, I think they will be impressed.
Interesting times.
Maui