Pretty certain you can't. If the plane has wifi then fine but your phone should be in flight mode for the entire flight. You can of course use bluetooth for anything downloaded. Unless of course you have any evidence that the authorities have confirmed that isn't the case?
Go to more of the less glamourous games and build up the points. I know a few that have done that over the last few years and are now in the top tier, even for Brentford.
Hypothetically yes, but in reality, as I said, I doubt anyone who would be in the top tier for Brentford isn't already going to Rome.
At the end of the day, Rome points won't be added however Fulham ones will.
Even if it did, I doubt very much that anyone that isn't going to Rome would have been in the top tier for the very limited number of tickets for Brentford, Brentford allocation being about half of that available for Rome!!