I know that we've recently started bringing in Bates saddles with flocking. I've so far only seen the dressage ones, still waiting on the shipment with the jumping and GP saddles. I know the cair close contact had adjustable kneeblocks. As does the Bates Momentum event saddle (although I'm not sure if that comes in a flock yet?) You'd have to speak to your local stockist to find out.
The Wintec 500 close contact (new version), also comes with a flock, but again, not sure about the knee rolls being adjustable. I don't see why they wouldn't be though, since the original version is.
Up the price scale, Prestige Italy does a beautiful eventing saddle which is flocked, comes with different sized knee/thigh rolls, and those are fully adjustable too. Also 'close contact' being as it's a jumping saddle.