, Ardberg.
The 848 is a great bike, but as you will discover when you do your training, a bike with less power and a more upright riding position makes learning easier.
To answer a couple of your points....
1 There are enough days in the year when the weather is good enough to make riding fun. Anywhere in Europe.
2 Cost of the license. Over time this will become more expensive. Save money! Do it now.
3 Cost of an 848. Hmmm...may be better to get a Monster first?
4 People who learn to ride motorcycles improve their car-driving skills at the same time. So your girlfriend will be safer when she is in your car. You want her to be safe, don't you?