You might could grow some, but I could not guarantee that it would grow. You can buy bamboo stakes for plants at some plant nurseries. You can also use wooden dowels, drilled, for handles, and old knitting needles make great handles for all sorts of tools. Use dental floss to tie the hair into a nice bundle (unless it is still attached to the hide) and dip in epoxy glue. Insert into the handle and allow to dry well. I like to try my tied 'brushes' with water before gluing them in, just to be sure I like what they do.
I happen to know for a fact that UK has a lot of bunnies running around. We lived there for 3 years, loved, loved, loved it!
I am now beseeching my son the Duck Hunter to bring feathers from the ducks. We shall see. I was planning to use them for raku.