Perhaps, but when you need hoses in the sky, an all 330 fleet simply won't ever give us the numbers required.
I see the Israelis are investigating a tanker version of the G550 with Gulfstream. A boom and 4 underwing pylons will, apparently, give it a 50K giveaway capability at 600nm from base.
Now that's a nice tactical tanker, I wonder if it could be fitted with bang seats....