FWIW
I use the French 'FIS' publication VFR flight package obtainable in the UK now. It contains amongst other things comprehesive details of all R and D areas and if used as part of flight planning, or refered to in flight if your plans change, you should have no problems.
Details include maps, operational hours, vertical limits, these being in precise figures not the sign of the +, and frequencies to contact for information and crossing permission.
I am not familiar with Bottlang, but it appears they have similar information.
The low level route virtually ringing France is as TvR states and should give little nav problem unless cloud base restricts flight .