IMHO there are a few things to consider before launching a full business class service on such a crowded route :
- do you offer an attractive frequent flyer program ?
- do you have enough daily flights ?
- is your aircraft fast enough (e.g. will the passenger notice the M.04 to M.08 cruise difference compared to a B747 ?)
I think the Privatair model is the way to go ! (except for the cruise M numbers...).