Or one could stay above 4500' and be guided all the way. ATC are there to help, why not make use of it?
Regarding the the TSA's: they are military training areas, I seem to remember they have to do with UAV's. There's a shooting range around EBLB Elsenborn which may be related.
These TSA's are active per NOTAM, check them out at
Belgocontrol - Air Traffic Safety: Our Mission I think it would be very exceptional for them to be active in the weekend, but it never hurts to make double sure.
Belgocontrol - Air Traffic Safety: Our Mission also has the AIP which should explain fully.