The Belgium element might be difficult. It would be very expensive to try to recreate the nuke bunker that currently exists at the SHAPE facility. The above ground office buildings wouldn't be much of a problem. The NATO civilians would be fit to be tied. Those guys draw a fat, tax free income and spend most of their evenings on silly social events.
It was hard enough to get things done in NATO when it was only 12 nations. Lots of bickering. I worked as a contractor in the SHAPE facility over a cumulative period of 20 weeks. I can't ever recall seeing any French military The staff in the nuke bunker was mostly American, English, German, Italian and a couple of Scots. The civilians were Dutch, Turkish and Belgian.