Hi Blitz,
This is one of my routes that is a compromise on M/W, D/C/W and relatively good roads.
Calais A26 for 80 miles to J8, T/R D939 cambrai to roundabout T/R onto ring road D643 around Cambrai T/R onto D643 to le cateau, just after Le Cat T/L onto D959 to Landrecies onto D959 then D962 Avenses sur Helpe T/L onto N2 T/R onto D962 solre le chateau D962 and N596 to Beaumont.
N40 to Philippeville onto N97 towards Dinant Dual Carraigeway, at 1st Roundabout T/R D949 Leignon + T/L just before rail crossing onto D938 to N4, T/R onto N4 (for 10 miles) T/L N888 La Roche T/R N833 La Roche, When you see a Tank T/L.
At lights T/L onto N89 vielsalm, staright over lights at Vielsalm onto N675 to Poteau and T/R (easy to miss) N675 to A27/E42 and T/L onto E42 for approx 16 miles to 410 Prum / Gerolstein/Kelberg. T/L Mullenbach/ Nurburgring Or T/R onto 257 towards Ulmen and 259 Auderath and hotel & Petrol (next door).
I usually stay here
http://www.hotel-wilhelmshoehe.de/en/welcome/welcome.html approx 20 mins good ride to the ring, good secure garage parking and Jackie (owner) is English and very helpful.
Have you seen this? It is a good read
http://jocke.selincite.com/bikes/riding-nurburgring
Hope this helps, if you need any further advice send me a pm.
Phil