I don't have any experience propagating Hazel's but I don't think they are any harder to propagate from cuttings then the average tree or bush. In my research I came across at least one nursery that was cloning a specific variety.
Also they might sucker a bit and they will grow back from the root if you coppice them so I think there should be an easy way to reproduce them other then by seed.
Oh cool. I want to get good at cloning and grafting before it's necessary. I've had a bit of success with haskaps and gooseberries and this year I will try layering them.
Good for you! There is no excuse to not be working on your skillz!