I would not bother getting a CRMC Eligibility certificate for Chimay or Gedinne. I did Gedinne last year and they didn't ask for one. You can do both on one event race and parade licences at 85€ they do have parade sessions as well as races. Depends exactly which master cylinder it is, others have used the adjustable lever type, for me they are just too expensive, and you will adjust it to one end anyway!. The floating discs would definitely be an issue for CRMC. There has been a guy with a 920 Commando fitted with one at a couple of CRMC meetings in recent years, nobody protested, but if he had been competitive I probably would have mentioned it. With the amount we spend to have an eligible period style non-floating brake it is just a bit cheaky to fit modern parts and expect others to be OK with that. There was an English guy running at Gedinne on a Seeley Norton last year with floating discs, yes a pair. But he ran as post classic, which as a 920 he was forced to do as the classics are up to 750 in Belgium. I would like to do Gedinne again, it is a brilliant track, but it is the week before Ledenon in the French VMA Championship, maybe next year. I have a French National licence this year and will do up to 4 rounds of the VMA, I ran at one in May but retired. They have just been down to Spain but we had visitors!, so we will be out again at Carole in mid June where I am hoping for better luck.