Disclaimer-
I'm an American, but I work a lot in the business jet world. I think business jets would be a great idea. It might not pay off immediately but down the road. Once you get training on those jets, you will become a hot commodity for the operators of the jets looking for an in-house director of maintenance. Over here I deal with guys that manage fleets of 4-5 Gulfstreams, Boeing BBJs, even 1 or 2 Falcons and they demand 6 figures. Most of them worked for the service center to cut their teeth and then get poached by the owner/operators that bring their birds in for maintenance. So my advice, if Europe is anything like the U.S., is to get that training, get a couple of years experience and keep your open for opportunities, because if you're good at what you do, they will come.